overexertion vs effort

overexertion and effort both are nouns.

Word	Noun	Adjective	Verb	Adverb
overexertion	Yes	No	No	No
effort	Yes	No	No	No

As nouns, effort is a hypernym of overexertion; that is, effort is a word with a broader meaning than overexertion:

overexertion: excessive exertion; so much exertion that discomfort or injury results
effort: use of physical or mental energy; hard work

Other hypernyms of overexertion include elbow grease, exertion, sweat, travail.

overexertion (noun)	effort (noun)
excessive exertion; so much exertion that discomfort or injury results	earnest and conscientious activity intended to do or accomplish something
	use of physical or mental energy; hard work
	a notable achievement
	a series of actions advancing a principle or tending toward a particular end