expo vs aggregation

expo and aggregation both are nouns.

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

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

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

Other hypernyms of expo include accumulation, assemblage, collection.

expo (noun)	aggregation (noun)
a collection of things (goods or works of art etc.) for public display	the act of gathering something together
	several things grouped together or considered as a whole