exhaust vs exhaust valve

exhaust and exhaust valve both are nouns.

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

exhaust (noun)	exhaust valve (noun)
system consisting of the parts of an engine through which burned gases or steam are discharged	a valve through which burned gases from a cylinder escape into the exhaust manifold
gases ejected from an engine as waste products

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