travail vs toil

travail and toil both are nouns.

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

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

Other hypernyms of travail include labor, labour.

As verbs, travail and toil are synonyms defined as:

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

travail (noun)	toil (noun)
use of physical or mental energy; hard work	productive work (especially physical work done for wages)
concluding state of pregnancy; from the onset of contractions to the birth of a child

travail (verb)	toil (verb)
work hard	work hard