universe vs aggregation

universe and aggregation both are nouns.

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

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

universe: (statistics) the entire aggregation of items from which samples can be drawn
aggregation: several things grouped together or considered as a whole

Other hypernyms of universe include accumulation, assemblage, collection.

universe (noun)	aggregation (noun)
everything stated or assumed in a given discussion	the act of gathering something together
(statistics) the entire aggregation of items from which samples can be drawn	several things grouped together or considered as a whole
everything that exists anywhere