bunch vs aggregation

bunch and aggregation both are nouns.

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

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

Other hypernyms of bunch include accumulation, assemblage, collection.

bunch (noun)	aggregation (noun)
a grouping of a number of similar things	the act of gathering something together
an informal body of friends	several things grouped together or considered as a whole
any collection in its entirety

bunch (verb)	aggregation (verb)
gather or cause to gather into a cluster
form into a bunch