Trap blocks are mechanical devices used for controlling movement and direction, and there are various synonyms for this term. Some of the common synonyms for a trap block include snag, bar, catch, and arrestor. A snag is a barrier obstructing movement, while a bar refers to a solid object used for blocking or restricting access. A catch is a device that holds something in place, while an arrestor is a device used for stopping or slowing down movement. Other synonyms for a trap block may include obstruction, barricade, barrier, blockage, and stoppage. Overall, the synonyms for a trap block illustrate the diverse ways in which this device can be used for controlling and stopping movement.