expo vs exhibition

expo and exhibition both are nouns.

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

As nouns, expo and exhibition are synonyms defined as:

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

Other synonyms of expo include exposition.

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