collection vs archives

collection and archives both are nouns.

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

As nouns, archives is a hyponym of collection; that is, archives is a word with a more specific, narrower meaning than collection:

Other hyponyms of collection include anthology, compilation, digest.

collection (noun)	archives (noun)
the act of gathering something together	collection of records especially about an institution
a publication containing a variety of works
request for a sum of money
several things grouped together or considered as a whole