obscenity vs rotten

obscenity is a noun but rotten is not a noun.

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

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

obscenity (adjective)	rotten (adjective)
	having decayed or disintegrated; usually implies foulness
	damaged by decay; hence unsound and useless
	very bad