category vs accumulation

category and accumulation both are nouns.

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

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

Other hypernyms of category include aggregation, assemblage, collection.

category (noun)	accumulation (noun)
a general concept that marks divisions or coordinations in a conceptual scheme	the act of accumulating
a collection of things sharing a common attribute	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