cataphract vs body armour

cataphract and body armour both are nouns.

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

As nouns, cataphract and body armour are synonyms defined as:

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

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