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Color

1. Color
2. Black
3. White
4. Blue
5. Green
6. Red
7. Yellow
8. Orange
9. Purple
10. Brown

Tools

1. Drawing
   1. Pencil
   2. Pen
   3. Chalk
2. Painting
   1. Paint
3. Sculpture
   1. Clay
   2. Stone

Music

1. Music
2. Baroque music
3. European classical music
4. Folk music
5. Jazz
6. Pop music
7. Rhythm and blues
8. Songs

Musical instruments

1. Violin
2. Piano
3. Drum
4. Horn
5. Flute

Theater, Dance

1. Dance
   1. Salsa
   2. Tango
2. Theatre

Actors and entertainers

1. Charlie Chaplin

Artists

1. Francisco Goya
2. Hokusai
3. Henri Matisse
4. Michelangelo
5. Claude Monet
6. Leonardo da Vinci
7. Pablo Picasso
8. Raphael
9. Rembrandt
10. Diego Velázquez
11. Vincent van Gogh

Authors

1. Dante Alighieri
2. Aristophanes
3. William Blake
4. Miguel de Cervantes
5. Fyodor Dostoevsky
6. Brothers Grimm
7. Homer
8. Li Bai
9. Molière
10. Pablo Neruda
11. Edgar Allan Poe
12. William Shakespeare
13. George Bernard Shaw
14. Sophocles
15. Mark Twain
16. Virgil

Composers and musicians

1. Johann Sebastian Bach
2. Ludwig van Beethoven
3. Frédéric Chopin
4. Wolfgang Amadeus Mozart
5. Felix Mendelssohn
6. Johannes Brahms

Entrepreneurs

1. Andrew Carnegie
2. George Westinghouse

Explorers

1. Roald Amundsen
2. Jacques Cartier
3. Christopher Columbus
4. Hernán Cortés
5. Francis Drake
6. Vasco da Gama
7. Ferdinand Magellan
8. Marco Polo
9. Zheng He
10. Ibn Battuta

Inventors and scientists

1. Nicolaus Copernicus
2. Charles Darwin
3. Thomas Edison
4. Albert Einstein
5. Galileo Galilei
6. Johann Gutenberg
7. Carolus Linnaeus
8. Isaac Newton
9. Louis Pasteur
10. Nikola Tesla
11. Leonardo da Vinci

Mathematicians

1. Archimedes
2. Diophantus
3. Euclid
4. Leonhard Euler
5. Pierre de Fermat
6. Karl Friedrich Gauss
7. G. H. Hardy
8. David Hilbert
9. Gottfried Leibniz
10. Muhammad ibn Musa al-Khwarizmi
11. Henri Poincaré
12. Pythagoras
13. Ptolemy

Philosophers and social scientists

1. Aristotle
2. Averroes
3. Matsuo Basho
4. Confucius
5. René Descartes
6. Sigmund Freud
7. Johann Wolfgang von Goethe
8. Herodotus
9. Hippocrates
10. Ibn Khaldun
11. Immanuel Kant
12. Søren Kierkegaard
13. Laozi (Lao-Tzu)
14. Plato
15. Adam Smith
16. Socrates
17. Thales
18. Voltaire

Politicians and leaders

1. Akbar
2. Alexander the Great
3. Kofi Annan
4. Attila the Hun
5. Augustus
6. Pope Benedict XVI
7. Otto von Bismarck
8. Simón Bolívar
9. George W. Bush
10. Fidel Castro
11. Julius Caesar
12. Charlemagne
13. Winston Churchill
14. Cleopatra VII of Egypt
15. Elizabeth I of England
16. Hammurabi
17. Hannibal
18. Hirohito
19. Adolf Hitler
20. Genghis Khan
21. Lech Wałęsa
22. Nelson Mandela
23. Napoleon I of France
24. Kwame Nkrumah
25. Peter I of Russia
26. Vladimir Putin
27. Franklin D. Roosevelt
28. Saladin
29. Shaka Zulu
30. Sitting Bull
31. Joseph Stalin
32. Margaret Thatcher
33. Timur
34. Tutankhamun
35. George Washington
36. Wilhelm II of Germany
37. Mahatma Gandhi

1. Civilization
2. History
3. History of the world
4. Human evolution

Prehistory to Middle Ages

1. Ancient Egypt
2. Ancient Greece
3. Ancient Rome
4. Ancient China
5. Archaeology
6. Aztec
7. Black Death
8. Bronze Age
9. Byzantine Empire
10. Inca
11. Indus Valley Civilization
12. Iron Age
13. Maya civilization
14. Macedonian Empire
15. Mesoamerica
16. Middle Ages
17. Ottoman Empire
18. Prehistory
19. Stone Age
20. Sumer

Renaissance to Industrial Age

1. Age of Enlightenment
2. European colonization of the Americas
3. French Revolution
4. History of South Africa in the apartheid era
5. The Holocaust
6. Napoleonic Wars
7. Ming Dynasty
8. Mughal Empire
9. Ottoman Empire
10. Renaissance
11. Vikings

Industrial Age

1. Apartheid
2. Decolonization
3. Industrial Revolution
4. Chinese Civil War
5. Meiji Restoration
6. Russian Revolution of 1917
7. Scientific Revolution
8. Scramble for Africa
9. Space exploration
10. Spanish Civil War
11. Vietnam War
12. World War I
13. World War II

1. City
2. Country
3. Continent

Land types

1. Desert
2. Mountain
3. Ocean
4. River
5. Lake
6. Forest
7. Plains

Continents and regions

1. Africa
2. Antarctica
3. Asia
4. Europe
5. Latin America
6. Middle East
7. North America
8. South America

Countries

1. Afghanistan
2. Argentina
3. Australia
4. Bangladesh
5. Brazil
6. Canada
7. Cuba
8. Democratic Republic of the Congo
9. Egypt
10. Ethiopia
11. France
12. Germany
13. Greece
14. India
15. Indonesia
16. Iran
17. Iraq
18. Israel
19. Italy
20. Japan
21. Laos
22. Libya
23. Mexico
24. Nigeria
25. North Korea
26. People's Republic of China
27. Poland
28. Russia
29. Rwanda
30. Saudi Arabia
31. South Africa
32. South Korea
33. Spain
34. Thailand
35. Turkey
36. United Kingdom
37. United States
38. Vietnam
39. National flag
    1. Gallery of sovereign-state flags

Cities

1. Abuja
2. Athens
3. Baghdad
4. Bangkok
5. Beijing
6. Berlin
7. Buenos Aires
8. Brasilia
9. Cairo
10. Hong Kong
11. Istanbul
12. Jerusalem
13. Lagos
14. London
15. Madrid
16. Manila
17. Mecca
18. Mexico City
19. Moscow
20. Mumbai
21. New Delhi
22. New York
23. Paris
24. Rio de Janeiro
25. Rome
26. Saint Petersburg
27. São Paulo
28. Sarajevo
29. Seoul
30. Shanghai
31. Sydney
32. Tehran
33. Tokyo
34. Toronto
35. Vienna
36. Washington, D.C.

Bodies of water

1. Amazon River
2. Arctic Ocean
3. Atlantic Ocean
4. Caspian Sea
5. Great Barrier Reef
6. Great Lakes
7. Indian Ocean
8. Lake Victoria
9. Mediterranean Sea
10. Mississippi River
11. Niagara Falls
12. Nile
13. North Sea
14. Pacific Ocean
15. Panama Canal
16. Southern Ocean
17. Suez Canal

Mountains, valleys and deserts

1. Andes
2. Himalaya
3. Rocky Mountains
4. Sahara
5. Great Rift Valley
6. Alps

Structures

1. Door
2. Arch
3. Bridge
4. Canal
5. Dam
6. Dome
7. Roof
8. Stair
9. Window
10. Plumbing
11. Road
12. Railroad

Buildings

1. House
2. Pyramid
3. Tower
4. Aswan Dam
5. Colosseum
6. Eiffel Tower
7. Great Pyramid of Giza
8. Great Wall of China
9. Parthenon
10. Stonehenge
11. Taj Mahal
12. Seven Wonders of the World

Society

1. Society
2. Family
3. Adult
4. Child
5. Infant
6. Elder
7. Marriage
8. Law
   1. Constitution
9. Social sciences
   1. Archaeology
   2. Economics
   3. Education
   4. Political science
   5. Psychology
   6. Sociology

Behavior

1. Emotion
2. Thought
3. Sleep
4. Dream

Politics

1. Politics
2. Capitalism
3. Democracy
4. Diplomacy
5. Globalization
6. Government
7. Monarchy
8. Socialism
9. State
10. Theocracy

Organizations

1. International organizations
2. Arab League
3. African Union
4. Association of Southeast Asian Nations
5. Commonwealth of Independent States
6. Commonwealth of Nations
7. Council of Europe
8. European Union
9. Geneva Conventions
10. International Red Cross and Red Crescent Movement
11. NATO
12. Nobel Prize
13. Organization of the Petroleum Exporting Countries
14. Organization of American States
15. United Nations
    1. World Health Organization
    2. United Nations Children's Fund
    3. United Nations Educational, Scientific, and Cultural Organization
    4. Universal Declaration of Human Rights
16. Maps of international organizations

Business and economics

1. Agriculture
2. Business
3. Currency
4. Market
5. Supply and demand

Social issues

1. Sustainable development
2. Freedom
3. Human rights
4. Peace
5. Racism
6. Sexism
7. Slavery
8. War

Culture

Languages and Scripts

1. Alphabet
   1. Letter (alphabet)
   2. A , B , C , D , E , F , G , H , I , J , K , L , M
   3. N , O , P , Q , R , S , T , U , V , W , X , Y , Z
2. Word
3. Writing system
4. Language
   1. Arabic language
   2. Chinese language
   3. English language
   4. Esperanto
   5. French language
   6. Hindi
   7. Latin
   8. Portuguese language
   9. Spanish language

Literature and Media

1. Writing
2. Book
3. Grammar
4. Literature
5. Novel
6. Poetry
   1. One Thousand and One Nights
   2. Mahabharata
   3. Odyssey
   4. The Divine Comedy
7. Radio
8. Television

Philosophy

1. Philosophy
2. Ethics
3. Knowledge
4. Logic
5. Beauty
6. Scientific method

Religion

1. Religion
2. Deity
3. Mythology
4. Meditation
5. Prayer
6. Specific religions
   1. Buddhism
   2. Christianity
   3. Church
   4. Hinduism
   5. Bhagavad Gita
   6. Temple
   7. Islam
   8. Mosque
   9. Judaism
   10. Taoism

Recreation

1. Game
2. Toy
3. Athletics (track and field)
   1. Backgammon
   2. Chess
   3. Checkers
   4. Dice
   5. Go (board game)
   6. Mancala
   7. Playing cards
4. Sport
   1. Baseball
   2. Basketball
   3. Boxing
   4. Cricket
   5. Football (soccer)
   6. Olympic Games
   7. Tennis
   8. Swimming

1. Agriculture
2. Food
3. Cheese
4. Fruit
5. Soybean
6. Tobacco
7. Vegetable
8. Oil
9. Chocolate
10. Honey
11. Potato

Spices

1. Salt
2. Sugar

Grains

1. Wheat
2. Barley
3. Bread
4. Oat
5. Sorghum
6. Rice

Beverages

1. Water
2. Tea
3. Coffee
4. Soda
5. Wine

Sciences

1. Chemistry
2. Ecology
3. Geology
4. Physics
5. Astronomy
6. Biology

Chemistry

1. Chemical element
   1. Periodic table
   2. Carbon
   3. Oxygen
   4. Nitrogen
   5. Hydrogen
2. Chemical reaction
3. Acid
4. Alkali
5. Compound

Materials

1. Earth
2. Minerals
   1. Chalk
   2. Diamond
   3. Limestone
   4. Sandstone
   5. Granite
   6. Quartz
   7. Flint
   8. Salt
3. Petroleum
4. Cloth
   1. Cotton
   2. Silk
5. Metal
   1. Copper
   2. Gold
   3. Iron
   4. Silver
   5. Steel
   6. Aluminum
   7. Tin

Astronomy

1. Big Bang
2. Universe
3. Galaxy
   1. Milky Way
4. Star
5. Planet
6. Solar system
   1. Sun
   2. Mercury (planet)
   3. Venus
   4. Earth
   5. Moon
   6. Mars
   7. Jupiter
   8. Saturn

Physics

1. Atom , Molecule
2. Solid , Liquid , Gas
3. Energy
4. Heat
5. Gravity
6. Electricity
7. Magnetism
8. Sound
9. Newton's laws of motion

Weather and climate

1. Snow
2. Climate
3. Cloud
4. Drought
5. Earthquake
6. Flood
7. Global warming
8. Rain
9. Tornado
10. Tsunami
11. Volcano
12. Weather

Anatomy

1. Brain
2. Heart
3. Lung
4. Skeleton
5. Stomach
6. Liver
7. Skin
8. Head
9. Eye
10. Mouth
11. Ear
12. Arm
13. Leg

Biology

1. Organisms
   1. Pregnancy
   2. Embryo
   3. Digestion
   4. Respiration
   5. Evolution
2. Animal
   1. Bird
   2. Fish
   3. Insect
   4. Mammal
   5. Cattle
   6. Cat
   7. Dog
   8. Horse
   9. Human
   10. Reptile
   11. Dinosaur
   12. Snake
3. Bacteria
4. Virus
5. Fungus
6. Plant
   1. Grass
   2. Flower
   3. Tree

Medicine

1. Illnesses
   1. Cancer
   2. Cholera
   3. Common cold
   4. Fever
   5. Smallpox
   6. Tuberculosis
   7. Dysentery
   8. Diabetes mellitus
   9. Influenza
   10. Malaria
   11. Rabies
2. Sexually transmitted disease
   1. AIDS / HIV
   2. Syphilis
3. Conditions
   1. Deafness
   2. Blindness
   3. Mental illness
   4. Malnutrition
4. Treatments
   1. Medication , Penicillin
   2. Vaccine
   3. Surgery

1. Technology
2. History of technology
3. Engineering
4. Artificial intelligence

Energy

1. Electricity
2. Hydropower
3. Solar power
4. Wind power

Electronics

1. Electronics
2. Battery
3. Incandescent light bulb

Engineering

1. Tool
2. Mechanical engineering
3. Engine
   1. Electric motor
   2. Steam engine
4. Inclined plane
5. Lever
6. Pulley
7. Robot
8. Wheel
9. Nail
10. Screw
11. Wedge
12. Knife

Transportation

1. Vehicle
2. Aircraft
3. Automobile
4. Bicycle
5. Elevator
6. Helicopter
7. Motorcycle
8. Rapid transit
9. Stirrup
10. Train
11. Sail

Information technology

1. Information technology
2. Abacus
3. Calculator
4. Computer
5. Cryptography
6. Writing

Optical

1. Camera
2. Glasses
3. Laser
4. Lens
5. Microscope
6. Prism
7. Telescope

Media and communication

1. Telecommunication
2. Microphone
3. Mobile phone
4. Photography
5. Printing
6. Newspaper , Magazine
7. Radio
8. Telephone
9. Television
10. Typewriter
11. Video

Computers

1. Internet
2. World Wide Web
3. E-mail
4. Operating system
   1. Linux
   2. MS-DOS
   3. Microsoft Windows
   4. Mac OS
5. FTP
6. HTTP
7. Ethernet
8. Electronic mail
9. Internet service provider

Navigation and timekeeping

1. Clock
2. Compass
3. Gyroscope
4. Global Positioning System
5. Pendulum
6. Radar
7. Sonar
8. Sundial

Material and chemical

1. Fire
   1. Kerosene
   2. Gasoline
2. Metal
3. Plastic
4. Rubber

Food and health

1. Refrigerator
2. Stove
3. Electrocardiogram
4. Magnetic resonance imaging
5. Pasteurization
6. X-ray

Space

1. Space exploration
2. Rocket
3. Satellite
4. Space Shuttle
5. Hubble Space Telescope
6. International Space Station
7. Project Apollo

Numbers

1. Digit
2. Integer
3. Natural number
4. Fraction
5. Rational number
6. Real number
7. Pi
8. Complex number
9. Prime number
10. 0 , 1 , 2 , 3 , 4 , 5
11. 6 , 7 , 8 , 9 , 10

Arithmetic

1. Addition
2. Subtraction
3. Division
4. Multiplication
5. Exponentiation
6. Logarithm
7. Percentage
8. Square root

Equations

1. Variable
2. Function
3. Infinity
4. Limit
5. Series
6. Algebra
7. Analysis / Calculus
   1. Derivative
   2. Integral

Geometry

1. Line
2. Plane
3. Angle
4. Coordinates
5. Fractal

Other mathematics

1. Linear algebra
   1. Matrix
   2. Vector (spatial)
2. Logic
3. Number theory
   1. Proof
4. Probability theory
   1. Statistics
5. Topology
6. Trigonometry
7. Cryptography
8. Game theory

1. International System of Units
2. Metric system
3. Imperial unit
4. Area
5. Volume
6. Scale
7. Mass
8. Thermometer
9. Temperature
10. Speed

Time

1. Clock
2. Calendar
3. Second
4. Day
5. Week
6. Month
7. Season
8. Year

Distance

1. Ruler
2. Metre