cataphract vs body armor

cataphract and body armor both are nouns.

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

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

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

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