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Browse Topic Dictionaries
Build your topic vocabulary with these mini-dictionaries, which are groups of words related to common subject areas.
Choose a topic area from the list below to get started.
Categories Home
/
Nature
/
The Earth And Space
/
The Universe
Categories Home
Nature
Agriculture
Animal farming
Crops
Farm animals
Farm people
Growing crops
On the farm
Environment
Conservation
Natural disasters
The power industry
Waste and pollution
Landscape
Coastlines and the sea
Describing geographic regions
Mountains and valleys
Other geographic regions
Plants
Rivers and lakes
The Earth and space
Space travel
The Earth and the atmosphere
The sun and the moon
The universe
Weather
Rain
Sky
Snow and ice
Wind
asteroid
astronomy
astrophysics
Big Bang
black hole
comet
constellation
cosmic
cosmic dust
cosmos
dark matter
energy
fission
galaxy
gravity
hyperspace
implode
light year
matter
meteor
meteorite
moon
nebula
orbit
orbital
planet
planetarium
red dwarf
rotation
satellite
solar system
space
space-time
spin
star
the Milky Way
universe
vacuum
white dwarf
wormhole