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These are the top departments found from analyzing all discussions on Reddit that mention any Amazon listing.

Electronics
559 listings
Computers & Accessories
466 listings
Computer Components
162 listings
Internal Components
144 listings
Monitors
75 listings
Books
84 books
Computer Accessories & Peripherals
80 listings
Data Storage
60 listings
Tools & Home Improvement
53 listings
Computers & Tablets
39 listings
Internal Solid State Drives
45 listings
Laptops
35 listings
Video Games
49 listings
Traditional Laptops
33 listings
Networking Products
42 listings
Accessories & Supplies
43 listings
Fans & Cooling
38 listings
Audio & Video Accessories
36 listings
CPU Processors
15 listings
Patio, Lawn & Garden
28 listings
PC
24 listings
Office Products
16 listings
Memory
20 listings
Home & Kitchen
23 listings
Motherboards
21 listings
Accessories
21 listings
Cell Phones & Accessories
24 listings
Home Audio
21 listings
Industrial & Scientific
22 listings
Health & Household
21 listings
Office & School Supplies
13 listings
Network Adapters
17 listings
Cables & Interconnects
16 listings
Desk Accessories & Workspace Organizers
12 listings
Gardening & Lawn Care
19 listings
Platforms, Stands & Shelves
11 listings
Monitor Arms & Stands
11 listings
Accessories
20 listings
Graphics Cards
20 listings
Case Fans
17 listings
External Components
15 listings
CPU Cooling Fans
14 listings
Accessories
13 listings
Network Cards
15 listings
Indoor Gardening & Hydroponics
14 listings
USB Hubs
15 listings
Cables & Interconnects
14 listings
Nintendo Switch
13 listings
Sports & Outdoors
13 listings
Speakers
13 listings
Safety & Security
7 listings
Sports & Fitness
12 listings
Kitchen & Dining
12 listings
Computer Cable Adapters
13 listings
Memory Cards
12 listings
Micro SD Cards
12 listings
Bookshelf Speakers
11 listings
Musical Instruments
12 listings
Gaming Keyboards
10 listings
Politics & Social Sciences
12 books
Computers & Technology
11 books
Lighting & Ceiling Fans
10 listings
Self-Help
11 books
Relationships
11 books
Camera & Photo
10 listings
Kitchen & Bath Fixtures
9 listings
Bathroom Fixtures
9 listings
Bidet & Bidet Parts
9 listings
Health, Fitness & Dieting
10 books
Routers
8 listings
Powerline Network Adapters
7 listings
Bidet Attachments
8 listings
Exercise & Fitness
9 listings
Additive Manufacturing Products
10 listings
Keyboards, Mice & Accessories
10 listings
Headphone Accessories
9 listings
Power & Hand Tools
10 listings
Headphones
8 listings
Growing Lamps
8 listings
Computer Cases
8 listings
Keyboards
9 listings
Strength Training Equipment
7 listings
Hand Tools
9 listings
USB Cables
5 listings
Sexual Wellness
7 listings
Personal Protective Equipment
2 listings
Video Cables
8 listings
Maintenance, Upkeep & Repairs
8 listings
Automotive
8 listings
Switches
5 listings
Business & Money
7 books
Hearing Protection
1 listings
Ear Protection Accessories
1 listings
HDMI Cables
7 listings
Internal Power Supplies
8 listings
Home Theater
6 listings
Receivers & Amplifiers
6 listings
Car & Vehicle Electronics
6 listings
DVI-HDMI Adapters
7 listings
Microphones & Accessories
7 listings
Politics & Government
7 books
Laptop Accessories
7 listings
Hardware
6 listings
3D Printer Parts & Accessories
6 listings
Pet Supplies
5 listings
Cord Management
6 listings
Internal Hard Drives
3 listings
USB Network Adapters
6 listings
Hard Drive Accessories
5 listings
Hard Drive Enclosures
5 listings
Adapters
5 listings
Test, Measure & Inspect
5 listings
2 in 1 Laptops
2 listings
External Hard Drives
5 listings
Controllers
5 listings
Flashlights
5 listings
Handheld Flashlights
5 listings
Toys & Games
5 listings
Over-Ear Headphones
4 listings
Medical Books
4 books
Medicine
4 books
Studio Recording Equipment
5 listings
Connectors & Adapters
3 listings
Health Care
5 listings
Controllers
5 listings
History
4 books
SATA Cables
4 listings
Virtual Reality (VR) Headsets
5 listings
Car Electronics
5 listings
Car Video
5 listings
Beauty & Personal Care
5 listings
Baby Products
2 listings
Cables & Adapters
4 listings
Household Supplies
5 listings
Wall Lights
3 listings
Novelty Lighting
5 listings
Kitchen Utensils & Gadgets
4 listings
Screen Protectors
5 listings
Binoculars & Scopes
4 listings
Microscopes
4 listings
USB Microscopes
4 listings
Replacement Parts
4 listings
Batteries
4 listings
Growing Light Bulbs
4 listings
Desktops
4 listings
Towers
4 listings
Adult Toys & Games
4 listings
Sex Toys
4 listings
Social Sciences
4 books
External Sound Cards
3 listings
Chargers & Power Adapters
4 listings
Wall Chargers
4 listings
Outdoor Décor
4 listings
Thermometers & Weather Instruments
4 listings
Indoor Thermometers
4 listings
Home Décor
4 listings
Microphones
4 listings
Sports & Outdoors
2 books
3D Printer Accessories
4 listings
Accessories
4 listings
Television & Video
4 listings
Safer Sex
3 listings
Lubricants
3 listings
On-Dash Cameras
4 listings
External Solid State Drives
4 listings
Audio Cables
3 listings
RCA Cables
3 listings
Heating, Cooling & Air Quality
4 listings
Grocery & Gourmet Food
4 listings
Baby Care
1 listings
Bathing
1 listings
Soaps & Cleansers
1 listings
Body Wash
1 listings
Receivers
3 listings
LED Strip Lights
4 listings
Programming
3 books
Electrical
3 listings
Welding & Soldering
4 listings
Soldering & Brazing Equipment
4 listings
PlayStation 5
2 listings
Oils & Fluids
4 listings
Cleaners
4 listings
Electrical Cleaners
4 listings
Humor & Entertainment
3 books
Cookbooks, Food & Wine
3 books
Measuring Tools & Scales
3 listings
Scales
3 listings
Digital Scales
3 listings
Clothing, Shoes & Jewelry
4 listings
Legacy Systems
4 listings
Distribution
3 listings
Selector Switch Boxes
3 listings
I/O Port Cards
3 listings
USB Port Cards
3 listings
Night Lights
2 listings
Mental Health
3 books
Modems
3 listings
KVM Switches
3 listings
Hunting & Fishing
3 listings
Wireless Access Points
3 listings
Medical Supplies & Equipment
3 listings
Office Furniture & Lighting
3 listings
Furniture Accessories
3 listings
Pest Control
3 listings
USB-to-USB Adapters
3 listings
Power Cables
3 listings
Gaming Mice
3 listings
Condenser Microphones
3 listings
Video Converters
3 listings
Flight Controls
3 listings
Computer Science
3 books
Power Cages
2 listings
Amplifiers
3 listings
Amps
3 listings
Cooling Pads & External Fans
3 listings
Thermal Paste & Pads
3 listings
Silicon Grease
3 listings
Coffee, Tea & Espresso
3 listings
Headphone & In-Ear Audio Monitors
3 listings
Headphones
3 listings
Cutlery & Knife Accessories
2 listings
Literature & Fiction
3 books
Water Cooling Systems
3 listings
Virtual Reality
2 listings
Standalone Hardware
2 listings
Arts, Crafts & Sewing
3 listings
Earbud Headphones
3 listings
Individual Sports
1 books
Accessories
3 listings
Cell Phones
3 listings
Unlocked Cell Phones
3 listings
Economics
3 books
Skin Care
3 listings
Cooking by Ingredient
2 books
Audio & Video Accessories
2 listings
Computer Microphones
2 listings
Men
3 listings
Watches
3 listings
Wrist Watches
3 listings
Ear Care
3 listings
Earplugs
3 listings
Repeaters
3 listings
Temperature & Humidity
2 listings
Furniture Hardware
2 listings
Furniture Legs
2 listings
Americas
2 books
Puzzles & Games
2 books
New, Used & Rental Textbooks
2 books
World
2 books
Dildos
2 listings
Biographies & Memoirs
2 books
Sleep & Snoring
2 listings
Sleep Sound Machines
2 listings
Batteries & Chargers
2 listings
Batteries
2 listings
Women's Health
2 books
Bluetooth Network Adapters
2 listings
Health Monitors
2 listings
Consoles
2 listings
Games
2 listings
Repellents
2 listings
Door Hardware & Locks
2 listings
Tools & Equipment
2 listings
Hair Care
2 listings
Uninterruptible Power Supply (UPS)
2 listings
Mice
2 listings
Investing
2 books
Paint, Wall Treatments & Supplies
2 listings
Wallpaper & Wallpapering Supplies
2 listings
3D Wall Panels
2 listings
Chef's Knives
1 listings
Psychology & Counseling
2 books
Docking Stations
2 listings
Video Surveillance
1 listings
Surveillance Cameras
1 listings
Bullet Cameras
1 listings
Clocks
2 listings
Alarm Clocks
2 listings
Vehicle Electronics Accessories
1 listings
Vehicle Audio & Video Installation
1 listings
Amplifier Installation
1 listings
Noise Filters
1 listings
Science & Math
2 books
Mathematics
2 books
HDMI-to-VGA Adapters
2 listings
Casters
2 listings
USB Gadgets
2 listings
USB Fans
2 listings
Benches
2 listings
Adjustable Benches
2 listings
3D Printing Supplies
2 listings
3D Printing Filament
2 listings
Candy & Chocolate
2 listings
Jelly Beans & Gummy Candy
2 listings
Gummy Candy
2 listings
Dogs
2 listings
Headsets
2 listings
Action & Adventure
2 books
Turntables & Accessories
2 listings
Turntables
2 listings
Games
2 listings
Games & Strategy Guides
2 books
Cable Sleeves
2 listings
Painting, Drawing & Art Supplies
2 listings
Painting
2 listings
Airbrush Materials
2 listings
Airbrush Sets
2 listings
Xbox One
2 listings
Accessories
2 listings
Air Purifiers
2 listings
Picture Hangers
2 listings
Sharpening Stones
2 listings
Televisions
2 listings
Breakers, Load Centers & Fuses
1 listings
Accessories
1 listings
Meter Sockets
1 listings
Single Board Computers
2 listings
Fish & Aquatic Pets
1 listings
Aquarium Test Kits
1 listings
Subwoofers
2 listings
Internal TV Tuner & Capture Cards
2 listings
Furniture
2 listings
Living Room Furniture
2 listings
TV & Media Furniture
2 listings
Tobacco-Related Products
2 listings
Children's Books
2 books
Network Attached Storage
2 listings
Devices
2 listings
3D Printers
2 listings
Vocal
2 listings
Hubs
2 listings
Adhesives, Sealants & Lubricants
2 listings
Industrial Lubricants
2 listings
Thunderbolt Cables
2 listings
Stands
2 listings
Cable Raceways
2 listings
Processes & Infrastructure
1 books
Stands
2 listings
Cable Ties
1 listings
Computer Recording
1 listings
Audio Interfaces
1 listings
Ceiling Lights
1 listings
Close To Ceiling Lights
1 listings
Shooting
1 listings
Eyewear & Hearing Protection
1 listings
Earmuffs
1 listings
Dumbbells
1 listings
Multipurpose
1 listings
Reptiles & Amphibians
1 listings
Terrarium Heat Lamps & Mats
1 listings
Heat Mats
1 listings
Business & Finance
1 books
Novelty & Gag Toys
1 listings
Gag Toys & Practical Jokes
1 listings
Laptop Network Adapters
1 listings
Historical
1 books
3D Printer Extruders
1 listings
Door Stops
1 listings
Temperature Controllers
1 listings
Body Weight Scales
1 listings
Digital
1 listings
Diagnostic, Test & Measurement Tools
1 listings
Code Readers & Scan Tools
1 listings
Humor
1 books
Water Sports
1 books
Weight Racks
1 listings
Thermometers
1 listings
Digital Thermometers
1 listings
Education & Teaching
1 books
Schools & Teaching
1 books
Substance Analysis Instrumentation
1 listings
pH Testing
1 listings
pH Meters
1 listings
Home Theater Systems
1 listings
Digital-to-Analog Converters
1 listings
Cleaning & Repair
1 listings
Compressed Air Dusters
1 listings
Addiction & Recovery
1 books
Styling Tools & Appliances
1 listings
Hair Brushes
1 listings
Photo Albums, Frames & Accessories
1 listings
Picture Frames
1 listings
Wall & Tabletop Frames
1 listings
Vitamins & Dietary Supplements
1 listings
Minerals
1 listings
Magnesium
1 listings
Hobbies
1 listings
Remote & App Controlled Vehicles & Parts
1 listings
Remote & App Controlled Vehicle Parts
1 listings
Radios & Parts
1 listings
Radio Antennas
1 listings
Virtual Reality
1 listings
Power Transmission Products
1 listings
Springs
1 listings
Compression
1 listings
Hand Tools
1 listings
Soil Test Kits
1 listings
Dehumidifiers
1 listings
Motorcycle & Powersports
1 listings
Accessories
1 listings
Electronics
1 listings
Alarms & Anti-Theft
1 listings
Mac
1 listings
Accessories
1 listings
Controllers
1 listings
Gamepads & Standard Controllers
1 listings
Cutters
1 listings
Wire Cutters
1 listings
Calibration
1 listings
Under-Cabinet Lights
1 listings
Heatsinks
1 listings
Kettles & Tea Machines
1 listings
Electric Kettles
1 listings
Taps & Dies
1 listings
Tap Extractors
1 listings
Toy Figures & Playsets
1 listings
Action Figures
1 listings
Mounts
1 listings
Speaker Mounts
1 listings
Growing Light Fixtures
1 listings
Antennas
1 listings
Radio Antennas
1 listings
Small Animals
1 listings
Houses & Habitats
1 listings
Cages
1 listings
Cookware
1 listings
Pots & Pans
1 listings
Skillets
1 listings
Baits & Lures
1 listings
Programming Languages
1 books
Crafts, Hobbies & Home
1 books
Pets & Animal Care
1 books
Kindle Store
2 books
Kindle eBooks
2 books
Medical eBooks
1 books
Mobility & Daily Living Aids
1 listings
Bathroom Safety, Aids & Accessories
1 listings
Bedpans & Urinals
1 listings
Female Urinals
1 listings
Mouse Pads & Wrist Rests
1 listings
Mouse Pads
1 listings
Pantry Staples
1 listings
Cooking & Baking
1 listings
Leaveners & Yeasts
1 listings
Active Dry Yeasts
1 listings
Serial Adapters
1 listings
Soils, Fertilizers & Mulches
1 listings
Fertilizers & Plant Food
1 listings
Testers
1 listings
Multi Testers
1 listings
Household Batteries
1 listings
AA
1 listings
Cable Straps
1 listings
Headsets
1 listings
Doors, Gates & Ramps
1 listings
Playpens
1 listings
Hunting
1 listings
Knives & Tools
1 listings
Hunting Knife Sharpeners
1 listings
Portable Audio & Video
1 listings
CB & Two-Way Radios
1 listings
Two-Way Radios
1 listings
Storage & Organization
1 listings
Food Storage
1 listings
Food Containers
1 listings
Container Sets
1 listings
Ethernet Cables
1 listings
Cat 5e Cables
1 listings
Air Ionizers
1 listings
Camera Batteries
1 listings
Body
1 listings
Moisturizers
1 listings
Creams
1 listings
Humanities
1 books
Professionals & Academics
1 books
QLED TVs
1 listings
Coffee Makers
1 listings
Cold Brew Coffee Makers
1 listings
Preamps
1 listings
USB Flash Drives
1 listings
Vibrators
1 listings
Clitoral
1 listings
Genre Fiction
1 books
On-Ear Headphones
1 listings
Building Toys
1 listings
Stacking Blocks
1 listings
Databases & Big Data
1 books
Industrial Electrical
1 listings
Semiconductor Products
1 listings
Signal Components
1 listings
Signal Converters
1 listings
SIM Cards & Prepaid Minutes
1 listings
Outdoor Recreation
1 listings
Camping & Hiking
1 listings
Lights & Lanterns
1 listings
Lanterns
1 listings
Electric Lanterns
1 listings
Controllers
1 listings
Lamps & Shades
1 listings
Table Lamps
1 listings
Baking
1 books
DVI Cables
1 listings
Graphics Tablets
1 listings
Bidets
1 listings
Cigarette Accessories
1 listings
Machines
1 listings
Television Stands & Entertainment Centers
1 listings
Masks & Respirators
1 listings
Respirators
1 listings
Reusable Respirators
1 listings
Soldering Stations
1 listings
Shampoo & Conditioner
1 listings
Shampoos
1 listings
Xbox 360
1 listings
Games
1 listings
Television Accessories
1 listings
TV Mounts, Stands & Turntables
1 listings
TV Ceiling & Wall Mounts
1 listings
Heating Quilts & Mats
1 listings
Pulse Oximeters
1 listings
Beading & Jewelry Making
1 listings
Jewelry Making Tools & Accessories
1 listings
Loupes
1 listings
Watering Equipment
1 listings
Sprinklers
1 listings
Beverages
1 listings
Janitorial & Sanitation Supplies
1 listings
Waste Receptacles & Liners
1 listings
Trash Bags & Liners
1 listings
Can Liners
1 listings
In-Visor Video
1 listings
Generators & Portable Power
1 listings
Generators
1 listings
3D Printer Platforms
1 listings
Small Appliances
1 listings
Specialty Appliances
1 listings
Dehydrators
1 listings
Earpads
1 listings
Grills & Outdoor Cooking
1 listings
Outdoor Cooking Tools & Accessories
1 listings
Grill Thermometers
1 listings
Realistic
1 listings
Window Treatments
1 listings
Window Stickers & Films
1 listings
Window Films
1 listings
Reference
1 books
Encyclopedias & Subject Guides
1 books
Solder & Flux
1 listings
Solder
1 listings
Management & Leadership
1 books
Vises
1 listings
Pin Vises
1 listings
Religion & Spirituality
1 books
Atheism
1 books
Alternative Medicine
1 books
Cables & Adapters
1 listings
Adapters
1 listings
Pots, Planters & Container Accessories
1 listings
Plant Container Accessories
1 listings
Inspection & Analysis
1 listings
Borescopes
1 listings
Education & Reference
1 books
PlayStation 4
1 listings
Virtual Reality
1 listings
Headsets
1 listings
Studio Monitors
1 listings
Lock Replacement Parts
1 listings
Memory Card Accessories
1 listings
Memory Card Readers
1 listings
Arts & Photography
1 books
Other Media
1 books
Wii U
1 listings
Accessories
1 listings
Joysticks
1 listings
Seasonal Décor
1 listings
Seasonal Lighting
1 listings
Rope Lights
1 listings
PlayStation 3
1 listings
Accessories
1 listings
Controllers
1 listings
Racing Wheels
1 listings
Training & Behavior Aids
1 listings
Repellents
1 listings
Spray Repellents
1 listings
Lab & Scientific Products
1 listings
Lab Supplies & Consumables
1 listings
Lab Cleaning Supplies
1 listings
Ultrasonic Cleaners
1 listings
Knives
1 listings
Pocket Knives & Folding Knives
1 listings
Laundry
1 listings
Lint Removers
1 listings
Costumes & Accessories
1 listings
Men
1 listings
Accessories
1 listings
Headwear
1 listings
Rough Plumbing
1 listings
Drain Cleaning Equipment
1 listings
Drain Augers
1 listings
Computer Screws
1 listings
Growing Up & Facts of Life
1 books
Humidifiers
1 listings
Certification
1 books
Mini-SAS Cables
1 listings
Lighting Assemblies & Accessories
1 listings
Headlight Assemblies, Parts & Accessories
1 listings
Headlight Parts & Accessories
1 listings
Headlight Restoration Kits
1 listings
Jump Starters, Battery Chargers & Portable Power
1 listings
Battery Chargers
1 listings
Gamepads & Standard Controllers
1 listings
Faceplates, Protectors & Skins
1 listings
Coffee Grinders
1 listings
Electric Burr Grinders
1 listings
Exercise & Fitness
1 books
Tactical & Personal Defense
1 listings
Personal Defense Equipment
1 listings
Tactical Flashlights
1 listings
Power Tool Parts & Accessories
1 listings
Screwdriver Accessories
1 listings
Screwdriver Bits
1 listings
Specialty Bits
1 listings
Clamps
1 listings
Spring Clamps
1 listings
OTG Adapters
1 listings
Accessories
1 listings
Exercise Bands
1 listings
Sociology
1 books
Face
1 listings
Cleansers
1 listings
Washes
1 listings
Pregnancy & Maternity
1 listings
Maternity Pillows
1 listings
Bread Knives
1 listings
LED & LCD TVs
1 listings
Speaker Stands
1 listings
Machines & Devices
1 listings
Whole Home & Mesh Wi-Fi Systems
1 listings
Tripod & Monopod Accessories
1 listings
Camera Mounts & Clamps
1 listings
Telescope & Microscope Accessories
1 listings
Telescope Accessories
1 listings
Photo Adapters
1 listings
Dynamic Microphones
1 listings
Multipurpose
1 listings
Stuffed Animals & Plush Toys
1 listings
Building Supplies
1 listings
Building Materials
1 listings
Doors
1 listings
Garage Doors, Openers & Parts
1 listings
Keypads & Remotes
1 listings
Tobacco Pipes & Accessories
1 listings
Bags & Pouches
1 listings
Automobile Accessories
1 listings
Cradles
1 listings
Hammers
1 listings
Engineers' Hammers
1 listings
HEPA Air Purifiers
1 listings
Greenhouses & Accessories
1 listings
Parts & Accessories
1 listings
Ventilation Equipment
1 listings
Xbox
1 listings
Accessories
1 listings
Satellite TV Equipment
1 listings
Splitters
1 listings
Soldering Guns & Irons
1 listings
Irons
1 listings
Car Care
1 listings
Exterior Care
1 listings
Polishing & Waxing Kits
1 listings
Professional Dental Supplies
1 listings
Lab Materials & Small Equipment
1 listings
Christian Books & Bibles
1 books
Christian Living
1 books
Outlets & Accessories
1 listings
Standard Outlets
1 listings
Smartwatch Accessories
1 listings
Smartwatch Screen Protectors
1 listings
Wrenches
1 listings
Torque Wrenches
1 listings
Sunscreens & Tanning Products
1 listings
Sunscreens
1 listings
Facial Sunscreens
1 listings
Paper
1 listings
Notebooks & Writing Pads
1 listings
Hardcover Executive Notebooks
1 listings
Lighting & Studio
1 listings
Lighting
1 listings
On-Camera Video Lights
1 listings
Home Gyms
1 listings
Cardio Training
1 listings
Rowers
1 listings
Religion & Spirituality
1 books