sexual activity vs obscenity

sexual activity and obscenity both are nouns.

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

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