nominative case vs subject case

nominative case and subject case both are nouns.

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

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

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

Other synonyms of nominative case include nominative.

nominative case (noun)	subject case (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