exploit vs overexploit

exploit is a noun but overexploit is not a noun.

Word	Noun	Adjective	Verb	Adverb
exploit	Yes	No	Yes	No
overexploit	No	No	Yes	No

As verbs, overexploit is a hyponym of exploit; that is, overexploit is a word with a more specific, narrower meaning than exploit:

Other hyponyms of exploit include maximise, maximize, harness, mine, quarry, commercialize, milk.

exploit (noun)	overexploit (noun)
a notable achievement

exploit (verb)	overexploit (verb)
use or manipulate to one's advantage	exploit excessively
draw from; make good use of
work excessively hard