The term REVOLVING PART ON A MACHINE can be summarized as a ROTOR, which is a five-letter word. A ROTOR is a rotating part of a machine, such as an electric motor or generator, that is used to convert energy into motion or electricity. It is typically composed of several parts, including a shaft, bearings, and magnets. The ROTOR is the part of the machine that rotates, while the stator is the stationary part.