sweet Fanny Adams vs zero

sweet Fanny Adams and zero both are nouns.

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

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

sweet Fanny Adams: little or nothing at all
zero: 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, nil, nix, nothing, null, zilch, zip, zippo.

sweet Fanny Adams (noun)	zero (noun)
little or nothing at all	the sight setting that will cause a projectile to hit the center of the target with no wind blowing
	the point on a scale from which positive or negative numerical quantities can be measured
	a mathematical element that when added to another number yields the same number
	a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

sweet Fanny Adams (adjective)	zero (adjective)
	of or relating to the null set (a set with no members)
	indicating the absence of any or all units under consideration
	having no measurable or otherwise determinable value
	indicating an initial point or origin

sweet Fanny Adams (verb)	zero (verb)
	adjust (as by firing under test conditions) the zero of (a gun)
	adjust (an instrument or device) to zero value