craft union vs labor union

craft union and labor union both are nouns.

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

As nouns, labor union is a hypernym of craft union; that is, labor union is a word with a broader meaning than craft union:

craft union: a labor union whose membership is restricted to workers in a particular craft
labor union: an organization of employees formed to bargain with the employer

Other hypernyms of craft union include brotherhood, trade union, trades union, union.

craft union (noun)	labor union (noun)
a labor union whose membership is restricted to workers in a particular craft	an organization of employees formed to bargain with the employer