plate armour vs gorget

plate armour and gorget both are nouns.

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

As nouns, gorget is a hyponym of plate armour; that is, gorget 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
gorget: armor plate that protects the neck

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a historical type of personal armor made from iron or steel plates, which superseded mail during the 14th century.