collage vs accumulation

collage and accumulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
collage	Yes	No	No	No
accumulation	Yes	No	No	No

As nouns, accumulation is a hypernym of collage; that is, accumulation is a word with a broader meaning than collage:

Other hypernyms of collage include aggregation, assemblage, collection.

collage (noun)	accumulation (noun)
a paste-up made by sticking together pieces of paper or photographs to form an artistic image	the act of accumulating
any collection of diverse things	several things grouped together or considered as a whole
	(finance) profits that are not paid out as dividends but are added to the capital base of the corporation
	an increase by natural growth or addition