eat vs feast

eat is not a noun while feast is a noun.

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

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

eat (noun)	feast (noun)
	something experienced with great delight
	an elaborate party (often outdoors)
	a meal that is well prepared and greatly enjoyed
	a ceremonial dinner party for many people

eat (verb)	feast (verb)
cause to deteriorate due to the action of water, air, or an acid	partake in a feast or banquet
take in solid food	provide a feast or banquet for
eat a meal; take a meal	gratify
take in food; used of animals only
use up (resources or materials)
worry or cause anxiety in a persistent way