Gag and Visual joke

Gag noun - Something said or done to cause laughter.

Visual joke and gag are semantically related. In some cases you can replace phrase "Visual joke" with "Gag", this terms are similar.

Visual joke noun - A joke whose effect is achieved by visual means rather than by speech (as in a movie).

Gag and visual joke are semantically related. You can use "Gag" instead a noun phrase "Visual joke".