Cyborg and Mechanical device

Cyborg noun - A human being whose body has been taken over in whole or in part by electromechanical devices.

Mechanical device and cyborg are semantically related. In some cases you can use "Mechanical device" instead a noun "Cyborg".

Mechanical device noun - Mechanism consisting of a device that works on mechanical principles.

Cyborg and mechanical device are semantically related. You can use "Cyborg" instead a noun phrase "Mechanical device".