agglomeration vs collecting

agglomeration and collecting both are nouns.

Word	Noun	Adjective	Verb	Adverb
agglomeration	Yes	No	No	No
collecting	Yes	No	No	No

As nouns, collecting is a hypernym of agglomeration; that is, collecting is a word with a broader meaning than agglomeration:

Other hypernyms of agglomeration include aggregation, assembling, collection.

agglomeration (noun)	collecting (noun)
the act of collecting in a mass; the act of agglomerating	the act of gathering something together
a jumbled collection or mass