exhibition vs expo

exhibition and expo both are nouns.

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

As nouns, exhibition and expo are synonyms defined as:

exhibition and expo: a collection of things (goods or works of art etc.) for public display

Other synonyms of exhibition include exposition.

exhibition (noun)	expo (noun)
the act of exhibiting	a collection of things (goods or works of art etc.) for public display
a collection of things (goods or works of art etc.) for public display