grammar vs nominative

grammar and nominative both are nouns.

Word	Noun	Adjective	Verb	Adverb
grammar	Yes	No	No	No
nominative	Yes	Yes	No	No

grammar (noun)	nominative (noun)
the branch of linguistics that deals with syntax and morphology (and sometimes also deals with semantics)	the category of nouns serving as the grammatical subject of a verb

grammar (adjective)	nominative (adjective)
	serving as or indicating the subject of a verb and words identified with the subject of a copular verb
	appointed by nomination
	named; bearing the name of a specific person