plate armour vs tuille

plate armour and tuille both are nouns.

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

As nouns, tuille is a hyponym of plate armour; that is, tuille is a word with a more specific, narrower meaning than plate armour:

plate armour: specially hardened steel plate used to protect fortifications or vehicles from enemy fire
tuille: armor plate that protects the hip and thigh

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a historical type of personal armor made from iron or steel plates, which superseded mail during the 14th century.