nihil vs zippo

nihil and zippo both are nouns.

Word	Noun	Adjective	Verb	Adverb
nihil	Yes	No	No	No
zippo	Yes	No	No	No

As nouns, zippo is a hypernym of nihil; that is, zippo is a word with a broader meaning than nihil:

nihil: (Latin) nil; nothing (as used by a sheriff after an unsuccessful effort to serve a writ)
zippo: a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

Other hypernyms of nihil include aught, cipher, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip.

nihil (noun)	zippo (noun)
(Latin) nil; nothing (as used by a sheriff after an unsuccessful effort to serve a writ)	a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential