usance vs usage

usance and usage both are nouns.

Word	Noun	Adjective	Verb	Adverb
usance	Yes	No	No	No
usage	Yes	No	No	No

As nouns, usance and usage are synonyms defined as:

Other synonyms of usance include custom.

usance (noun)	usage (noun)
accepted or habitual practice	the act of using
(economics) the utilization of economic goods to satisfy needs or in manufacturing	accepted or habitual practice
the period of time permitted by commercial usage for the payment of a bill of exchange (especially a foreign bill of exchange)	the customary manner in which a language (or a form of a language) is spoken or written