eat vs sap

eat is not a noun while sap is a noun.

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

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

eat (noun)	sap (noun)
	a piece of metal covered by leather with a flexible handle; used for hitting people
	a person who lacks good judgment
	a watery solution of sugars, salts, and minerals that circulates through the vascular system of a plant

eat (verb)	sap (verb)
cause to deteriorate due to the action of water, air, or an acid	excavate the earth beneath
take in solid food	deplete
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