travail vs struggle

travail and struggle both are nouns.

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

As nouns, struggle is a hyponym of travail; that is, struggle is a word with a more specific, narrower meaning than travail:

travail (noun)	struggle (noun)
use of physical or mental energy; hard work	strenuous effort
concluding state of pregnancy; from the onset of contractions to the birth of a child	an energetic attempt to achieve something
	an open clash between two opposing groups (or individuals)

travail (verb)	struggle (verb)
work hard	be engaged in a fight; carry on a fight
	to exert strenuous effort against opposition
	climb awkwardly, as if by scrambling
	make a strenuous or labored effort