eat vs pasture

eat is not a noun while pasture is a noun.

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

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

Other hyponyms of eat include forage, raven, suckle, browse, crop, graze, range.

eat (noun)	pasture (noun)
	bulky food like grass or hay for browsing or grazing horses or cattle
	a field covered with grass or herbage and suitable for grazing by livestock

eat (verb)	pasture (verb)
cause to deteriorate due to the action of water, air, or an acid	feed as in a meadow or pasture
take in solid food	let feed in a field or pasture or meadow
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