1) Light-switch cover 2) Protection 3) Protective cover 4) Protective covering 
Faceplate (face plate, face-plate) is a plastic or metal plate, cover, or bezel on the face (front) of a device or surface, such as: ...
A rigid array of short fibres fused together to form the face of a cathode ray tube.
[n] - a protective covering for the front of a machine or device (as a door lock or computer component)
a glass or a plastic window on a full face mask or a helmet.
Circular plate held on the headstock spindle to which the workpiece is attached by screws.
A large circular plate with slots and holes for mounting the workpiece to be machined. It is attached to the headstock of a lathe. See also: Lathe.
NATO codename for Ye-2A delta-wing jet fighter [SU]
noun a protective covering for the front of a machine or device (as a door lock or computer component)