armor plating vs egis

armor plating and egis both are nouns.

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

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

armor plating: 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

armor plating (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