numismatology vs aggregation

numismatology and aggregation both are nouns.

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

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

Other hypernyms of numismatology include assembling, collecting, collection.

numismatology (noun)	aggregation (noun)
the collection and study of money (and coins in particular)	the act of gathering something together
	several things grouped together or considered as a whole