accusative vs accusative case

accusative and accusative case both are nouns.

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

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

accusative and accusative case: the case of nouns serving as the direct object of a verb

Other synonyms of accusative include objective case.

accusative (noun)	accusative case (noun)
the case of nouns serving as the direct object of a verb	the case of nouns serving as the direct object of a verb

accusative (adjective)	accusative case (adjective)
serving as or indicating the object of a verb or of certain prepositions and used for certain other purposes
containing or expressing accusation