accumulation vs buildup

accumulation and buildup both are nouns.

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

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

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

Other hyponyms of accumulation include backup, deposit, deposition.

accumulation (noun)	buildup (noun)
the act of accumulating	the act of building up an accumulation
several things grouped together or considered as a whole	highly favorable publicity and praise
(finance) profits that are not paid out as dividends but are added to the capital base of the corporation	the result of the process of accumulation
an increase by natural growth or addition