craft union vs brotherhood

craft union and brotherhood both are nouns.

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

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

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

craft union (noun)	brotherhood (noun)
a labor union whose membership is restricted to workers in a particular craft	the feeling that men should treat one another like brothers
	people engaged in a particular occupation
	an organization of employees formed to bargain with the employer
	the kinship relation between a male offspring and the siblings