drain vs exhaust

drain and exhaust both are nouns.

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

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

Other hypernyms of drain include consume, deplete, eat, eat up, expend, run through, use, use up, wipe out.

drain (noun)	exhaust (noun)
emptying something accomplished by allowing liquid to run out of it	system consisting of the parts of an engine through which burned gases or steam are discharged
a gradual depletion of energy or resources	gases ejected from an engine as waste products
a pipe through which liquid is carried away
tube inserted into a body cavity (as during surgery) to remove unwanted material

drain (verb)	exhaust (verb)
empty of liquid; drain the liquid from	wear out completely
make weak	eliminate (a substance)
deplete of resources	use up the whole supply of
flow off gradually	use up (resources or materials)
	deplete