armor vs body armour

armor and body armour both are nouns.

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

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

Other hyponyms of armor include body armor, cataphract, coat of mail, suit of armor, suit of armour, buckler, shield.

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

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