Categories (words):



Astronomy
Celestial bodies

Astronomical observation

Astronautics






Earth
Geography

Geology

Meteorology

Environment






Plant kingdom
Plant life

Simple plants

Plant

Industrial use






Animal kingdom
Evolution of life

Primitive animals

Molluscs

Crustaceans

Insects and arachnids

Cartilaginous fishes

Bony fishes

Amphibians

Reptiles

Birds

Insectivorous mammals

Rodens

Lagomorphs

Ungulate mammals

Carnivorous mammals

Merine mammals

Primates

Flying mammals

Marsupial mammals






Human being
Human body

Anatomy

Sense organs






Food and kitchen
Supply

Plant-derived food

Animal-based food

Processed foods

Food business

Kitchen

Cutlery

Kitchen equipment






House
Location

Elements of a house

Structure of a house

Heating

Air conditioning

Plumbing

Electricity

House furnishings






Do-it-yourself and gardening
Materials

Carpentry

Plumbing and masonry

Electricity

Soldering

Painting unkeep

Ladders and stepladders

Pleasure garden

Gardening materials

Snow removal






Clothing
Textiles

Historical clothes

Men's clothing

Unisex clothing

Women's clothing

Specialty clothing

Design and finishing

Headgear

Shoes

Dress accessories






Personal adornment and articles
Personal adornment

Personal articles






Arts and architecture
Ancient architecture

Military architecture

Western architecture

Asian and pre-Columbian architecture

Elements of architecture

Housing

Fine arts

Graphic arts

Performing arts

Music

Crafts






Communications
Languages of the world

Written communication

Photography

Telecommunications

Radio

Microphones and accessories

Stereo sound system

Wireless communication

Telephony






Office automation
Computer equipment

Networking

Office






Transport and machinery
Road transport

Automobile road transport

Cycling road transport

Rail transport

Urban rail transport

Maritime transport

Air transport

Handling

Heavy machinery






Energy
Geothermal energy

Fossil energy

Hydroelectricity

Nuclear energy

Solar energy

Wind energy






Science
Chemistry

Physics: mechanics

Physics: electricity and magnetism

Physics: optics

Measuring devices

Scientific symbols






Society
City

Economy and finance

Justice

Education

Religion

Politics

Weapons

War arsenal

Safety

Health

Family






Sports and games
Sports facilities

Track and field

Ball sports

Racket sports

Gymnastics

Aquatic and nautical sports

Combat sports

Strength sports

Equestrian sports

Precision and accuracy sports

Cycling

Motor sports

Winter sports

Sports on wheels

Aerial sports

Mountain sports

Outdoor leisure

Games