exhaust valve vs exhaust

exhaust valve and exhaust both are nouns.

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

exhaust valve (noun)	exhaust (noun)
a valve through which burned gases from a cylinder escape into the exhaust manifold	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 valve (verb)	exhaust (verb)
	wear out completely
	eliminate (a substance)
	use up the whole supply of
	use up (resources or materials)
	deplete