body armour vs suit of armour

body armour and suit of armour both are nouns.

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

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

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

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

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