spit out vs exhaust

spit out is not a noun while exhaust is a noun.

Word	Noun	Adjective	Verb	Adverb
spit out	No	No	Yes	No
exhaust	Yes	No	Yes	No

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

Other hypernyms of spit out include discharge, eject, expel, release.

spit out (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

spit out (verb)	exhaust (verb)
spit up in an explosive manner	wear out completely
discharge (phlegm or sputum) from the lungs and out of the mouth	eliminate (a substance)
utter with anger or contempt	use up the whole supply of
	use up (resources or materials)
	deplete