craft union vs trades union

craft union and trades union both are nouns.

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

As nouns, trades union is a hypernym of craft union; that is, trades 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
trades union: an organization of employees formed to bargain with the employer

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

craft union (noun)	trades 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