herbarium vs accumulation

herbarium and accumulation both are nouns.

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

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

herbarium: a collection of dried plants that are mounted and systematically classified for study
accumulation: several things grouped together or considered as a whole

Other hypernyms of herbarium include aggregation, assemblage, collection.

herbarium (noun)	accumulation (noun)
a collection of dried plants that are mounted and systematically classified for study	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