excrete vs exhaust

excrete is not a noun while exhaust is a noun.

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

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

Other hypernyms of excrete include discharge, eject, expel, release.

excrete (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

excrete (verb)	exhaust (verb)
eliminate from the body	wear out completely
	eliminate (a substance)
	use up the whole supply of
	use up (resources or materials)
	deplete