Rod and Six-shooter

Rod noun - A heavy rigid stick used as a weapon or for punishment.

Six-shooter and rod are semantically related In some cases you can use "Six-shooter" instead a noun "Rod".

Six-shooter noun - A pistol with a revolving cylinder (usually having six chambers for bullets).

Rod and six-shooter are semantically related in revolver topic. You can use "Rod" instead a noun phrase "Six-shooter", if it concerns topics such as inexpensive handgun.