Pulley and Rollers

Pulley noun - A simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope.

Rollers and pulley are semantically related in curler topic. In some cases you can use "Rollers" instead a noun "Pulley".

Pulley and rollers are semantically related in circle topic. You can use "Pulley" instead a noun "Rollers", if it concerns topics such as curler.