have a go at it vs smut

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

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

have a go at it (noun)	smut (noun)
	creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire
	an offensive or indecent word or phrase
	any fungus of the order Ustilaginales
	destructive diseases of plants (especially cereal grasses) caused by fungi that produce black powdery masses of spores
	a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink

have a go at it (verb)	smut (verb)
have sexual intercourse with	affect with smut or mildew, as of a crop such as corn
	stain with a dirty substance, such as soot
	become affected with smut
	make obscene