obscenity vs obscene

obscenity is a noun but obscene is not a noun.

Word	Noun	Adjective	Verb	Adverb
obscenity	Yes	No	No	No
obscene	No	Yes	No	No

obscenity (noun)	obscene (noun)
an obscene act
the trait of behaving in an obscene manner
an offensive or indecent word or phrase

obscenity (adjective)	obscene (adjective)
	suggestive of or tending to moral looseness
	designed to incite to indecency or lust
	offensive to the mind