give birth vs labor

give birth is not a noun while labor is a noun.

Word	Noun	Adjective	Verb	Adverb
give birth	No	No	Yes	No
labor	Yes	No	Yes	No

give birth (noun)	labor (noun)
	productive work (especially physical work done for wages)
	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

give birth (verb)	labor (verb)
cause to be born	undergo the efforts of childbirth
create or produce an idea	work hard
	strive and make an effort to reach a goal