body armour vs armor

body armour and armor both are nouns.

Word	Noun	Adjective	Verb	Adverb
body armour	Yes	No	No	No
armor	Yes	No	Yes	No

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

Other hypernyms of body armour include armour.

body armour (noun)	armor (noun)
armor that protects the wearer's whole body	tough more-or-less rigid protective covering of an animal or plant
	protective covering made of metal and used in combat
	a military unit consisting of armored fighting vehicles

body armour (verb)	armor (verb)
	equip with armor