travail vs exertion

travail and exertion both are nouns.

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

As nouns, travail and exertion are synonyms defined as:

Other synonyms of travail include effort, elbow grease, sweat.

travail (noun)	exertion (noun)
use of physical or mental energy; hard work	use of physical or mental energy; hard work
concluding state of pregnancy; from the onset of contractions to the birth of a child

travail (verb)	exertion (verb)
work hard