mythology vs accumulation

mythology and accumulation both are nouns.

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

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

mythology: myths collectively; the body of stories associated with a culture or institution or person
accumulation: several things grouped together or considered as a whole

Other hypernyms of mythology include aggregation, assemblage, collection.

mythology (noun)	accumulation (noun)
the study of myths	the act of accumulating
myths collectively; the body of stories associated with a culture or institution or person	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