exhaust vs spew

exhaust is a noun but spew is not a noun.

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

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

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