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Robert's AnswerView 8 Other Answers
Robert FrostRobert Frost, engineer/instructor at NASA
An asteroid is a rocky, sometimes metallic, body that is smaller than a planetoid/minor planet.

A comet is body composed largely of ice and aggregate rock. They often orbit the sun in an extremely elliptical orbit.  As it approaches the sun, ice vaporizes creating a tail.

A meteroid is a fragment of either an asteroid or a comet.

As for the suffixes:

meteoroid - in space
meteor - the streak of light of a meteoroid traveling through the atmosphere
meteorite - on the surface