STAR (astr)
AGAINST (anti-)
GOOD (bene, bon)
LIFE (bio)
TIME (chron)
100

*

asterisk

100

Fights diseases!

Antibody

100

Quality, skill, experience

Credential

100

Science that deals with things that are alive

Biology

100

Continuing again and again for a long time

Chronic

200

Extremely large

Astronomical

200

Not friendly to other people

Antisocial

200

NOT causing death or serious injury

Benign

200

Chemical substance dangerous to living things

Biohazard

200

Arranged in order by time created

Chronological

300

A person who travels in outer space

Astronaut

300

Stops harmful effects of poison

Antidote

300

Something good that is MORE than what was expected

Bonus

300

Drug used to kill harmful bacteria and cure infections

Antibiotic

300

A description of events as they happened

Chronicle

400

A small body (rock) that circles the sun

Asteroid

400

Prevents infection by killing bacteria

Antiseptic

400

Existing in large amounts (think FEAST)

Bountiful

400

Story of one's life written by someone else

Biography

400

A watch or clock

Chronometer

500

A person who studies stars, planets, etc.

Astronomer

500

Strong feeling of dislike

Antipathy

500

Kind and generous

Benevolent

500

Capable of breaking down slowly

Biodegradable

500

Making things happen at the same time and speed

Synchronize