agglomerate vs collection

agglomerate and collection both are nouns.

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

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

Other hypernyms of agglomerate include accumulation, aggregation, assemblage.

agglomerate (noun)	collection (noun)
a collection of objects laid on top of each other	the act of gathering something together
volcanic rock consisting of large fragments fused together	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole

agglomerate (adjective)	collection (adjective)
clustered together but not coherent

agglomerate (verb)	collection (verb)
form into one cluster