utilization vs usage

utilization and usage both are nouns.

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

As nouns, utilization and usage are synonyms defined as:

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

utilization (noun)	usage (noun)
the act of using	the act of using
the state of having been made use of	accepted or habitual practice
	the customary manner in which a language (or a form of a language) is spoken or written