collage vs aggregation

collage and aggregation both are nouns.

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

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

Other hypernyms of collage include accumulation, assemblage, collection.

collage (noun)	aggregation (noun)
a paste-up made by sticking together pieces of paper or photographs to form an artistic image	the act of gathering something together
any collection of diverse things	several things grouped together or considered as a whole