body armour vs suit of armor

body armour and suit of armor both are nouns.

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

As nouns, body armour and suit of armor are synonyms defined as:

body armour and suit of armor: armor that protects the wearer's whole body

Other synonyms of body armour include body armor, cataphract, coat of mail, suit of armour.

body armour (noun)	suit of armor (noun)
armor that protects the wearer's whole body	armor that protects the wearer's whole body