currentness vs currency

currentness and currency both are nouns.

Word	Noun	Adjective	Verb	Adverb
currentness	Yes	No	No	No
currency	Yes	No	No	No

As nouns, currentness and currency are synonyms defined as:

Other synonyms of currentness include up-to-dateness.

currentness (noun)	currency (noun)
the property of belonging to the present time	the property of belonging to the present time
	general acceptance or use
	the metal or paper medium of exchange that is presently used