have a go at it vs obscenity

have a go at it is not a noun while obscenity is a noun.

Word	Noun	Adjective	Verb	Adverb
have a go at it	No	No	Yes	No
obscenity	Yes	No	No	No

have a go at it (noun)	obscenity (noun)
	an obscene act
	the trait of behaving in an obscene manner
	an offensive or indecent word or phrase

have a go at it (verb)	obscenity (verb)
have sexual intercourse with