herbarium vs assemblage

herbarium and assemblage both are nouns.

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

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

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

Other hypernyms of herbarium include accumulation, aggregation, collection.

herbarium (noun)	assemblage (noun)
a collection of dried plants that are mounted and systematically classified for study	the social act of assembling
	a system of components assembled together for a particular purpose
	a group of persons together in one place
	several things grouped together or considered as a whole