null vs naught

null and naught both are nouns.

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

As nouns, null and naught are synonyms defined as:

null and naught: 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, nada, nil, nix, nothing, zero, zilch, zip, zippo.

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

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