herbarium vs aggregation

herbarium and aggregation both are nouns.

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

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

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

Other hypernyms of herbarium include accumulation, assemblage, collection.

herbarium (noun)	aggregation (noun)
a collection of dried plants that are mounted and systematically classified for study	the act of gathering something together
	several things grouped together or considered as a whole