physical exertion vs travail

physical exertion and travail both are nouns.

Word	Noun	Adjective	Verb	Adverb
physical exertion	Yes	No	No	No
travail	Yes	No	Yes	No

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

physical exertion: the activity of exerting your muscles in various ways to keep fit
travail: use of physical or mental energy; hard work

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

physical exertion (noun)	travail (noun)
the activity of exerting your muscles in various ways to keep fit	use of physical or mental energy; hard work
	concluding state of pregnancy; from the onset of contractions to the birth of a child

physical exertion (verb)	travail (verb)
	work hard