agglomerate vs accumulation

agglomerate and accumulation both are nouns.

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

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

Other hypernyms of agglomerate include aggregation, assemblage, collection.

agglomerate (noun)	accumulation (noun)
a collection of objects laid on top of each other	the act of accumulating
volcanic rock consisting of large fragments fused together	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

agglomerate (adjective)	accumulation (adjective)
clustered together but not coherent

agglomerate (verb)	accumulation (verb)
form into one cluster