nebulous vs astronomy

nebulous is not a noun while astronomy is a noun.

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

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

nebulous (adjective)	astronomy (adjective)
of or relating to or resembling a nebula
lacking definition or definite content
lacking definite form or limits