oblique case vs oblique

oblique case and oblique both are nouns.

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

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

oblique case and oblique: any grammatical case other than the nominative

oblique case (noun)	oblique (noun)
any grammatical case other than the nominative	a diagonally arranged abdominal muscle on either side of the torso
	any grammatical case other than the nominative

oblique case (adjective)	oblique (adjective)
	slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled
	indirect in departing from the accepted or proper way; misleading