Industrial union and Trades union

Industrial union noun - A labor union that admits all workers in a given industry irrespective of their craft.

Trades union and industrial union are semantically related in labor union topic. In some cases you can use "Trades union" instead a noun phrase "Industrial union", when it comes to topics like organized group of employees.

Trades union noun - An organization of employees formed to bargain with the employer.

Industrial union and trades union are semantically related in labor union topic. You can use "Industrial union" instead a noun phrase "Trades union", if it concerns topics such as organized group of employees.