cataphract vs suit of armor

cataphract

noun
  • Defensive armour covering the entire body of a soldier and often the soldier's horse as well, especially the linked mail or scale armour of some eastern nations. 

  • A soldier (especially a horseman) covered with a cataphract (etymology 1, sense 1). 

adj
  • Of a galley such as a trireme: with the upper tier of rowers shielded rather than exposed. 

suit of armor

noun
  • A collection of garments, usually made of metal, worn over the body for protection in battle from weapons. 

How often have the words cataphract and suit of armor occurred in a corpus of books? (source: Google Ngram Viewer )