labor vs uterine contraction

labor and uterine contraction both are nouns.

Word	Noun	Adjective	Verb	Adverb
labor	Yes	No	Yes	No
uterine contraction	Yes	No	No	No

labor (noun)	uterine contraction (noun)
productive work (especially physical work done for wages)	a rhythmic tightening in labor of the upper uterine musculature that contracts the size of the uterus and pushes the fetus toward the birth canal
any piece of work that is undertaken or attempted
a social class comprising those who do manual labor or work for wages
an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement
concluding state of pregnancy; from the onset of contractions to the birth of a child

labor (verb)	uterine contraction (verb)
undergo the efforts of childbirth
work hard
strive and make an effort to reach a goal