vertical union vs trade union

vertical union and trade union both are nouns.

Word	Noun	Adjective	Verb	Adverb
vertical union	Yes	No	No	No
trade union	Yes	No	No	No

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

vertical union: a labor union that admits all workers in a given industry irrespective of their craft
trade union: an organization of employees formed to bargain with the employer

Other hypernyms of vertical union include brotherhood, labor union, trades union, union.

vertical union (noun)	trade union (noun)
a labor union that admits all workers in a given industry irrespective of their craft	an organization of employees formed to bargain with the employer