labor vs bear on

labor is a noun but bear on is not a noun.

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

labor (noun)	bear on (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

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