usage vs utilisation

usage and utilisation both are nouns.

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

As nouns, usage and utilisation are synonyms defined as:

Other synonyms of usage include employment, exercise, use, utilization.

usage (noun)	utilisation (noun)
the act of using	the act of using
accepted or habitual practice
the customary manner in which a language (or a form of a language) is spoken or written