armour plate vs egis

armour plate and egis both are nouns.

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

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

armour plate: specially hardened steel plate used to protect fortifications or vehicles from enemy fire
egis: armor plate that protects the chest; the front part of a cuirass

armour plate (noun)	egis (noun)
specially hardened steel plate used to protect fortifications or vehicles from enemy fire	armor plate that protects the chest; the front part of a cuirass