sweet Fanny Adams vs nil

sweet Fanny Adams and nil both are nouns.

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

As nouns, nil is a hypernym of sweet Fanny Adams; that is, nil is a word with a broader meaning than sweet Fanny Adams:

sweet Fanny Adams: little or nothing at all
nil: a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

Other hypernyms of sweet Fanny Adams include aught, cipher, cypher, goose egg, nada, naught, nix, nothing, null, zero, zilch, zip, zippo.

sweet Fanny Adams (noun)	nil (noun)
little or nothing at all	a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential