agio vs agiotage

agio and agiotage both are nouns.

Word	Noun	Adjective	Verb	Adverb
agio	Yes	No	No	No
agiotage	Yes	No	No	No

As nouns, agio and agiotage are synonyms defined as:

Other synonyms of agio include exchange premium, premium.

agio (noun)	agiotage (noun)
a fee charged for exchanging currencies	a fee charged for exchanging currencies
	speculative dealing in stock exchange securities or foreign exchange.