spew vs exhaust

spew is not a noun while exhaust is a noun.

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

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

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

spew (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

spew (verb)	exhaust (verb)
eject the contents of the stomach through the mouth	wear out completely
expel or eject (saliva or phlegm or sputum) from the mouth	eliminate (a substance)
eject or send out in large quantities, also metaphorical	use up the whole supply of
	use up (resources or materials)
	deplete