compendium vs archives

compendium and archives both are nouns.

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

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

Other hyponyms of compendium include anthology, compilation, digest.

compendium (noun)	archives (noun)
a concise but comprehensive summary of a larger work	collection of records especially about an institution
a publication containing a variety of works