carcass vs carcase

carcass and carcase both are nouns.

Word	Noun	Adjective	Verb	Adverb
carcass	Yes	No	No	No
carcase	Yes	No	No	No

As nouns, carcass and carcase are synonyms defined as:

carcass and carcase: the dead body of an animal especially one slaughtered and dressed for food

carcass (noun)	carcase (noun)
the dead body of an animal especially one slaughtered and dressed for food	the dead body of an animal especially one slaughtered and dressed for food