exhaust vs run down

exhaust is a noun but run down is not a noun.

Word	Noun	Adjective	Verb	Adverb
exhaust	Yes	No	Yes	No
run down	No	No	Yes	No

As verbs, run down is a hyponym of exhaust; that is, run down is a word with a more specific, narrower meaning than exhaust:

As verbs, exhaust and run down are synonyms defined as:

Other synonyms of exhaust include play out, sap, tire.

exhaust (noun)	run down (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)	run down (verb)
wear out completely	use up all one's strength and energy and stop working
eliminate (a substance)	injure or kill by knocking (someone or something) down and passing over the body, as with a vehicle
use up the whole supply of	pursue until captured
use up (resources or materials)	move downward
deplete	examine hastily
	deplete
	trace