conchology vs aggregation

conchology and aggregation both are nouns.

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

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

Other hypernyms of conchology include assembling, collecting, collection, malacology.

conchology (noun)	aggregation (noun)
the collection and study of mollusc shells	the act of gathering something together
	several things grouped together or considered as a whole