obscenity vs sexual activity

obscenity and sexual activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
obscenity	Yes	No	No	No
sexual activity	Yes	No	No	No

obscenity (noun)	sexual activity (noun)
an obscene act	activities associated with sexual intercourse
the trait of behaving in an obscene manner
an offensive or indecent word or phrase