visor vs armor plate

visor and armor plate both are nouns.

Word	Noun	Adjective	Verb	Adverb
visor	Yes	No	No	No
armor plate	Yes	No	No	No

As nouns, armor plate is a hypernym of visor; that is, armor plate is a word with a broader meaning than visor:

visor: a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face
armor plate: specially hardened steel plate used to protect fortifications or vehicles from enemy fire

Other hypernyms of visor include armor plating, armour plate, plate armor, plate armour.

visor (noun)	armor plate (noun)
a brim that projects to the front to shade the eyes	specially hardened steel plate used to protect fortifications or vehicles from enemy fire
a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face