exhaust vs eject

exhaust is a noun but eject is not a noun.

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

As verbs, exhaust and eject are synonyms defined as:

Other synonyms of exhaust include discharge, expel, release.

exhaust (noun)	eject (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)	eject (verb)
wear out completely	eliminate (a substance)
eliminate (a substance)	cause to come out in a squirt
use up the whole supply of	put out or expel from a place
use up (resources or materials)	leave an aircraft rapidly, using an ejection seat or capsule
deplete