accumulation vs collection

accumulation and collection both are nouns.

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

As nouns, accumulation and collection are synonyms defined as:

accumulation and collection: several things grouped together or considered as a whole

Other synonyms of accumulation include aggregation, assemblage.

accumulation (noun)	collection (noun)
the act of accumulating	the act of gathering something together
several things grouped together or considered as a whole	a publication containing a variety of works
(finance) profits that are not paid out as dividends but are added to the capital base of the corporation	request for a sum of money
an increase by natural growth or addition	several things grouped together or considered as a whole