anti-
ast-
auto-
co-
de-
100

A liquid that fights against freezing.

antifreeze

100

A person who travels to outer space.

astronaut

100

A vehicle you can drive yourself.

automobile

100

A person you work with is a....

coworker

100

A different route to get somewhere.

detour
200

A medicine that fights infections.

antibiotic

200

A small, rocky object that orbits the sun.

asteroid

200

A signature that someone famous signs themselves.

autograph

200
To work together with other people.

Cooperate.

200

To translate a coded message.

decode

300

A medicine that cures poison.

antidote

300

A star-shaped symbol (*).

asterisk

300

A story about a person's life that they write themselves.

autobiography

300

Someone who works together with the pilot.

copilot

300

To not have enough water.

dehydrated

400

Something that fights germs (bacteria) when you use it.

antibacterial

400

The study of stars.

astronomy

400

When something runs by itself.

automated or automatic

400

When people live together (like roommates)

cohabitate

400

To get smaller or less; go down; turn down

decline

500

The end of the story or movie was not exciting. It was....

anticlimactic

500

What scientists use to measure light from stars.

astrometer
500

Making decisions and choices for YOURSELF

autonomy
500

When people or animals live peacefully together.

coexist

500

To turn off an alarm or piece of equipment.

deactivate

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