null vs nada

null and nada both are nouns.

Word	Noun	Adjective	Verb	Adverb
null	Yes	Yes	No	No
nada	Yes	No	No	No

As nouns, null and nada are synonyms defined as:

null and nada: a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

Other synonyms of null include aught, cipher, cypher, goose egg, naught, nil, nix, nothing, zero, zilch, zip, zippo.

null (noun)	nada (noun)
a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential	a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

null (adjective)	nada (adjective)
lacking any legal or binding force