labor vs travail

labor and travail both are nouns.

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

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

As nouns, labor and travail are synonyms defined as:

labor and travail: concluding state of pregnancy; from the onset of contractions to the birth of a child

Other synonyms of labor include childbed, confinement, labour, lying-in, parturiency.

As verbs, labor and travail are synonyms defined as:

Other synonyms of labor include dig, drudge, fag, grind, labour, moil, toil.

labor (noun)	travail (noun)
productive work (especially physical work done for wages)	use of physical or mental energy; hard work
any piece of work that is undertaken or attempted	concluding state of pregnancy; from the onset of contractions to the birth of a child
a social class comprising those who do manual labor or work for wages
an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement
concluding state of pregnancy; from the onset of contractions to the birth of a child

labor (verb)	travail (verb)
undergo the efforts of childbirth	work hard
work hard
strive and make an effort to reach a goal