exhibition vs collection

exhibition and collection both are nouns.

Word	Noun	Adjective	Verb	Adverb
exhibition	Yes	No	No	No
collection	Yes	No	No	No

As nouns, collection is a hypernym of exhibition; that is, collection is a word with a broader meaning than exhibition:

exhibition: a collection of things (goods or works of art etc.) for public display
collection: several things grouped together or considered as a whole

Other hypernyms of exhibition include accumulation, aggregation, assemblage.

exhibition (noun)	collection (noun)
the act of exhibiting	the act of gathering something together
a collection of things (goods or works of art etc.) for public display	a publication containing a variety of works
	request for a sum of money
	several things grouped together or considered as a whole