corpus vs collection

corpus and collection both are nouns.

Word	Noun	Adjective	Verb	Adverb
corpus	Yes	No	No	No
collection	Yes	No	No	No

As nouns, collection is a hypernym of corpus; that is, collection is a word with a broader meaning than corpus:

Other hypernyms of corpus include accumulation, aggregation, assemblage.

corpus (noun)	collection (noun)
the main part of an organ or other bodily structure	the act of gathering something together
a collection of writings	a publication containing a variety of works
capital as contrasted with the income derived from it	request for a sum of money
	several things grouped together or considered as a whole