uranology vs nebulous

uranology is a noun but nebulous is not a noun.

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

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

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