bear on vs labour

bear on is not a noun while labour is a noun.

Word	Noun	Adjective	Verb	Adverb
bear on	No	No	Yes	No
labour	Yes	No	Yes	No

bear on (noun)	labour (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

bear on (verb)	labour (verb)
have an effect upon	undergo the efforts of childbirth
press, drive, or impel (someone) to action or completion of an action	work hard
be relevant to	strive and make an effort to reach a goal
keep or maintain in unaltered condition; cause to remain or last