labor vs worker

labor and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
labor	Yes	No	Yes	No
worker	Yes	No	No	No

labor (noun)	worker (noun)
productive work (especially physical work done for wages)	sterile member of a colony of social insects that forages for food and cares for the larvae
any piece of work that is undertaken or attempted	a person who works at a specific occupation
a social class comprising those who do manual labor or work for wages	a member of the working class (not necessarily employed)
an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement	a person who acts and gets things done
concluding state of pregnancy; from the onset of contractions to the birth of a child

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