overexertion vs travail

overexertion and travail both are nouns.

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

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

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

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

overexertion (noun)	travail (noun)
excessive exertion; so much exertion that discomfort or injury results	use of physical or mental energy; hard work
	concluding state of pregnancy; from the onset of contractions to the birth of a child

overexertion (verb)	travail (verb)
	work hard