Capstan and Pulley block

Capstan noun - A windlass rotated in a horizontal plane around a vertical axis; used on ships for weighing anchor or raising heavy sails.

Pulley block and capstan are semantically related in crane topic. In some cases you can use "Pulley block" instead a noun "Capstan".

Pulley block 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.

Capstan and pulley block are semantically related in crane topic. You can use "Capstan" instead a noun phrase "Pulley block".