Mechanical device and Voting machine

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

Voting machine and mechanical device are semantically related. In some cases you can replace phrase "Voting machine" with "Mechanical device", this phrases are similar.

Voting machine noun - A mechanical device for recording and counting votes mechanically.

Mechanical device and voting machine are semantically related. You can use "Mechanical device" instead a noun phrase "Voting machine".