Plate armor and Visor

Plate armor noun - Specially hardened steel plate used to protect fortifications or vehicles from enemy fire.

Visor and plate armor are semantically related. In some cases you can replace term "Visor" with "Plate armor", this terms are similar.

Visor noun - A piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face.

Plate armor and visor are semantically related. Sometimes you can use "Plate armor" instead a noun "Visor".