accumulation vs aggregation

accumulation and aggregation both are nouns.

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

As nouns, accumulation and aggregation are synonyms defined as:

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

Other synonyms of accumulation include assemblage, collection.

accumulation (noun)	aggregation (noun)
the act of accumulating	the act of gathering something together
several things grouped together or considered as a whole	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