labor union vs labor movement

labor union and labor movement both are nouns.

Word	Noun	Adjective	Verb	Adverb
labor union	Yes	No	No	No
labor movement	Yes	No	No	No

labor union (noun)	labor movement (noun)
an organization of employees formed to bargain with the employer	an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement