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42,394 words to explore
167 words
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catch on
to understand something or become popular.
catch red-handed
To catch someone in the act of wrongdoing.
catch someone's eye
attract someone's attention.
catch up on
To do work or activities you did not have time for earlier.
caterpillar
The larval stage of a butterfly or moth.
cause a stir
To make many people excited, surprised, or upset.
celestial
related to the sky or outer space
celestial sphere
An imaginary ball around the earth on which the stars seem to lie.
cell
The smallest unit of living matter.
censorship
the suppression of speech or public communication.
census
An official count of a population.
central nervous system
The brain and spinal cord, which control the body's actions and senses.
centripetal force
A force that pulls a moving object toward the center of its circular path.
cerebellum
The brain part controlling movement and balance.
cerebrum
The largest part of the brain, used for thinking, memory, and movement.
challenging
Difficult in a way that tests your skills or effort.
chances are
It is likely or probable.
chaos
A state of complete confusion and disorder.
characteristically
in a way that is typical or distinctive
checks and balances
A system where each branch of government can limit the others' power.
cheer up
encourage someone to feel happier
chemical formula
A set of symbols and numbers showing which atoms make up a substance.
chew out
To speak angrily to someone because they did something wrong.
chip in
contribute money or effort.
Words selected by Inoh for the TOEFL iBT test. Not an official ETS list. How these words were chosen →