Apparatus and Pulley

Apparatus noun - Items needed for the performance of a task or activity.

Pulley and apparatus are semantically related. In some cases you can use "Pulley" instead a noun "Apparatus".

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.

Apparatus and pulley are semantically related. Sometimes you can use "Apparatus" instead a noun "Pulley".