herbarium vs collection

herbarium and collection both are nouns.

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

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

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

Other hypernyms of herbarium include accumulation, aggregation, assemblage.

herbarium (noun)	collection (noun)
a collection of dried plants that are mounted and systematically classified for study	the act of gathering something together
	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole