cubitiere vs plate armour

cubitiere and plate armour both are nouns.

Word	Noun	Adjective	Verb	Adverb
cubitiere	Yes	No	No	No
plate armour	Yes	No	No	No

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

cubitiere: body armor that protects the elbow
plate armour: specially hardened steel plate used to protect fortifications or vehicles from enemy fire

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

cubitiere (noun)	plate armour (noun)
body armor that protects the elbow	specially hardened steel plate used to protect fortifications or vehicles from enemy fire
	a historical type of personal armor made from iron or steel plates, which superseded mail during the 14th century.