depletion vs exhaustion

depletion and exhaustion both are nouns.

Word	Noun	Adjective	Verb	Adverb
depletion	Yes	No	No	No
exhaustion	Yes	No	No	No

As nouns, exhaustion is a hyponym of depletion; that is, exhaustion is a word with a more specific, narrower meaning than depletion:

Other hyponyms of depletion include consumption, expenditure, using up, drain.

depletion (noun)	exhaustion (noun)
the act of decreasing something markedly	the act of exhausting something entirely
the state of being depleted	serious weakening and loss of energy
	extreme fatigue