utilization vs utilisation

utilization and utilisation both are nouns.

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

As nouns, utilization and utilisation are synonyms defined as:

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

utilization (noun)	utilisation (noun)
the act of using	the act of using
the state of having been made use of