astronomy vs coma

astronomy and coma both are nouns.

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

astronomy (noun)	coma (noun)
the branch of physics that studies celestial bodies and the universe as a whole	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)