exhaust vs eat

exhaust is a noun but eat is not a noun.

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

As verbs, exhaust and eat are synonyms defined as:

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

As verbs, eat is a hypernym of exhaust; that is, eat is a word with a broader meaning than exhaust:

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

exhaust (noun)	eat (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

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