eat vs eater

eat is not a noun while eater is a noun.

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

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

eat (verb)	eater (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