body armor vs armour

body armor and armour both are nouns.

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

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

Other hypernyms of body armor include armor.

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