rubbing vs travail

rubbing and travail both are nouns.

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

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

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

rubbing (noun)	travail (noun)
effort expended in moving one object over another with pressure	use of physical or mental energy; hard work
representation consisting of a copy (as of an engraving) made by laying paper over something and rubbing it with charcoal	concluding state of pregnancy; from the onset of contractions to the birth of a child
the resistance encountered when one body is moved in contact with another

rubbing (verb)	travail (verb)
	work hard