Mechanical device and Windscreen wiper

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

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

Windscreen wiper noun - A mechanical device that cleans the windshield.

Mechanical device and windscreen wiper are semantically related. You can use "Mechanical device" instead a noun phrase "Windscreen wiper".