travail vs exercising

travail and exercising both are nouns.

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

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

travail: use of physical or mental energy; hard work
exercising: the activity of exerting your muscles in various ways to keep fit

travail (noun)	exercising (noun)
use of physical or mental energy; hard work	the activity of exerting your muscles in various ways to keep fit
concluding state of pregnancy; from the onset of contractions to the birth of a child

travail (verb)	exercising (verb)
work hard