cataphract vs coat of mail

cataphract and coat of mail both are nouns.

Word	Noun	Adjective	Verb	Adverb
cataphract	Yes	No	No	No
coat of mail	Yes	No	No	No

As nouns, cataphract and coat of mail are synonyms defined as:

cataphract and coat of mail: armor that protects the wearer's whole body

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

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