comet vs coma

comet and coma both are nouns.

Word	Noun	Adjective	Verb	Adverb
comet	Yes	No	No	No
coma	Yes	No	No	No

comet (noun)	coma (noun)
(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit	a state of deep and often prolonged unconsciousness; usually the result of disease or injury
	(astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed
	(botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds)