Hair curler and Mechanical device

Hair curler noun - A mechanical device consisting of a cylindrical tube around which the hair is wound to curl it.

Mechanical device and hair curler are semantically related. In some cases you can use "Mechanical device" instead a noun phrase "Hair curler".

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

Hair curler and mechanical device are semantically related. Sometimes you can replace phrase "Hair curler" with "Mechanical device", this phrases are similar.