eat vs exhaust

eat is not a noun while exhaust is a noun.

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

As verbs, eat and exhaust are synonyms defined as:

Other synonyms of eat include consume, deplete, eat up, expend, run through, use, use up, wipe out.

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

eat (noun)	exhaust (noun)
	system consisting of the parts of an engine through which burned gases or steam are discharged
	gases ejected from an engine as waste products

eat (verb)	exhaust (verb)
cause to deteriorate due to the action of water, air, or an acid	wear out completely
take in solid food	eliminate (a substance)
eat a meal; take a meal	use up the whole supply of
take in food; used of animals only	use up (resources or materials)
use up (resources or materials)	deplete
worry or cause anxiety in a persistent way