numismatics vs aggregation

numismatics and aggregation both are nouns.

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

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

Other hypernyms of numismatics include assembling, collecting, collection.

numismatics (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