expo vs collection

expo and collection both are nouns.

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

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

expo: 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 expo include accumulation, aggregation, assemblage.

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