sweet Fanny Adams vs obscenity

sweet Fanny Adams and obscenity both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet Fanny Adams	Yes	No	No	No
obscenity	Yes	No	No	No

sweet Fanny Adams (noun)	obscenity (noun)
little or nothing at all	an obscene act
	the trait of behaving in an obscene manner
	an offensive or indecent word or phrase