accumulation vs accruement

accumulation and accruement both are nouns.

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

As nouns, accumulation and accruement are synonyms defined as:

Other synonyms of accumulation include accrual.

accumulation (noun)	accruement (noun)
the act of accumulating	the act of accumulating
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