testiere vs armor plating

testiere and armor plating both are nouns.

Word	Noun	Adjective	Verb	Adverb
testiere	Yes	No	No	No
armor plating	Yes	No	No	No

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

testiere: medieval plate armor to protect a horse's head
armor plating: specially hardened steel plate used to protect fortifications or vehicles from enemy fire

Other hypernyms of testiere include armor plate, armour plate, plate armor, plate armour.

testiere (noun)	armor plating (noun)
medieval plate armor to protect a horse's head	specially hardened steel plate used to protect fortifications or vehicles from enemy fire