METEORITE! A Meteorite is a meteoroid that reaches the surface of the earth without completely burning up!
METEOROIDS! A piece of stony or metallic material traveling in outer space! Smaller that asteroids! Also travel around the sun in orbits!
METEORS! A streak of light in the sky from a meteoroid burning up because of friction with gasses in the atmosphere. Usually they are called shooting or falling stars!
ASTEROIDS! Rocky and Metallic objects that orbit the sun! They are too small to be planets! They come from the Asteroid Belt in between Mars and Jupiter!