Comet: A body of ice, rock and dust that can be several miles in diameter and orbits the sun. Debris from comets is the source of many meteoroids.
Meteoroid: A small rocky or metal object, usually between the size of a grain of sand or a boulder, that orbits the sun. It originates from a comet or asteroid.
Meteor: A meteoroid that enters the earth’s atmosphere and vaporizes. Also called a “shooting star.”. Hope it's clear...cheers!!