vertical union vs industrial union

vertical union and industrial union both are nouns.

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

As nouns, vertical union and industrial union are synonyms defined as:

vertical union and industrial union: a labor union that admits all workers in a given industry irrespective of their craft

vertical union (noun)	industrial union (noun)
a labor union that admits all workers in a given industry irrespective of their craft	a labor union that admits all workers in a given industry irrespective of their craft