category vs aggregation

category and aggregation both are nouns.

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

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

Other hypernyms of category include accumulation, assemblage, collection.

category (noun)	aggregation (noun)
a general concept that marks divisions or coordinations in a conceptual scheme	the act of gathering something together
a collection of things sharing a common attribute	several things grouped together or considered as a whole