birthing vs travail

birthing and travail both are nouns.

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

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

birthing: the process of giving birth
travail: concluding state of pregnancy; from the onset of contractions to the birth of a child

birthing (noun)	travail (noun)
the process of giving birth	use of physical or mental energy; hard work
	concluding state of pregnancy; from the onset of contractions to the birth of a child

birthing (verb)	travail (verb)
	work hard