usage vs misuse

usage and misuse both are nouns.

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

As nouns, misuse is a hyponym of usage; that is, misuse is a word with a more specific, narrower meaning than usage:

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

usage (verb)	misuse (verb)
	change the inherent purpose or function of something
	apply to a wrong thing or person; apply badly or incorrectly