meteoroid vs meteor

meteoroid and meteor both are nouns.

Word	Noun	Adjective	Verb	Adverb
meteoroid	Yes	No	No	No
meteor	Yes	No	No	No

As nouns, meteoroid and meteor are synonyms defined as:

meteoroid and meteor: (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere

meteoroid (noun)	meteor (noun)
(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere	(astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere
	a streak of light in the sky at night that results when a meteoroid hits the earth's atmosphere and air friction causes the meteoroid to melt or vaporize or explode