assortment vs aggregation

assortment and aggregation both are nouns.

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

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

Other hypernyms of assortment include accumulation, assemblage, collection.

assortment (noun)	aggregation (noun)
the act of distributing things into classes or categories of the same type	the act of gathering something together
a collection containing a variety of sorts of things	several things grouped together or considered as a whole