nominative case vs nominative

nominative case and nominative both are nouns.

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

As nouns, nominative case and nominative are synonyms defined as:

nominative case and nominative: the category of nouns serving as the grammatical subject of a verb

Other synonyms of nominative case include subject case.

nominative case (noun)	nominative (noun)
the category of nouns serving as the grammatical subject of a verb	the category of nouns serving as the grammatical subject of a verb

nominative case (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