travail vs birth

travail and birth both are nouns.

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

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

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

Other hypernyms of travail include birthing, giving birth, parturition.

travail (noun)	birth (noun)
use of physical or mental energy; hard work	the event of being born
concluding state of pregnancy; from the onset of contractions to the birth of a child	a baby born; an offspring
	the process of giving birth
	the kinship relation of an offspring to the parents
	the time when something begins (especially life)

travail (verb)	birth (verb)
work hard	cause to be born