ensemble vs aggregation

ensemble and aggregation both are nouns.

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

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

ensemble: an assemblage of parts or details (as in a work of art) considered as forming a whole
aggregation: several things grouped together or considered as a whole

Other hypernyms of ensemble include accumulation, assemblage, collection.

ensemble (noun)	aggregation (noun)
a coordinated outfit (set of clothing)	the act of gathering something together
the chorus of a ballet company	several things grouped together or considered as a whole
a group of musicians playing or singing together
an assemblage of parts or details (as in a work of art) considered as forming a whole
a cast other than the principals