Join forces and Pull together

Join forces verb - Work together on a common enterprise or project.

Pull together and join forces are semantically related in aid topic. In some cases you can use "Pull together" instead a verb phrase "Join forces", when it comes to topics like unite, combine, cooperate.

Pull together verb - Assemble or get together.

Join forces and pull together are semantically related in aid topic. You can use "Join forces" instead a verb "Pull together", if it concerns topics such as unite, combine, cooperate, collaborate.