eat vs misuse

eat is not a noun while misuse is a noun.

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

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

eat (noun)	misuse (noun)
	improper or excessive use

eat (verb)	misuse (verb)
cause to deteriorate due to the action of water, air, or an acid	change the inherent purpose or function of something
take in solid food	apply to a wrong thing or person; apply badly or incorrectly
eat a meal; take a meal
take in food; used of animals only
use up (resources or materials)
worry or cause anxiety in a persistent way