eater vs eat

eater is a noun but eat is not a noun.

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

eater (noun)	eat (noun)
any green goods that are good to eat
someone who consumes food for nourishment

eater (verb)	eat (verb)
	cause to deteriorate due to the action of water, air, or an acid
	take in solid food
	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