friction vs travail

friction and travail both are nouns.

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

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

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

friction (noun)	travail (noun)
effort expended in moving one object over another with pressure	use of physical or mental energy; hard work
the resistance encountered when one body is moved in contact with another	concluding state of pregnancy; from the onset of contractions to the birth of a child
a state of conflict between persons

friction (verb)	travail (verb)
	work hard