cadaver vs remains

cadaver and remains both are nouns.

Word	Noun	Adjective	Verb	Adverb
cadaver	Yes	No	No	No
remains	Yes	No	No	No

As nouns, cadaver and remains are synonyms defined as:

Other synonyms of cadaver include clay, corpse, stiff.

cadaver (noun)	remains (noun)
the dead body of a human being	the dead body of a human being
	any object that is left unused or still extant
	a relic that has been excavated from the soil