pallium vs tabard

pallium

noun
  • A large cloak worn by Greek philosophers and teachers. 

  • The mantle of a mollusc. 

  • A woolen liturgical vestment resembling a collar and worn over the chasuble in the Western Christian liturgical tradition, conferred on archbishops by the Pope, equivalent to the Eastern Christian omophorion. 

  • The cerebral cortex. 

tabard

noun
  • A cape or tunic worn by a knight, emblazoned with the coat of arms of his king or queen on the front. 

  • A sleeveless garment made of coarse cloth formerly worn outdoors by the common people. 

  • A similar garment officially worn by a herald and emblazoned with his sovereign's coat of arms. 

  • A silk banner attached to a bugle or trumpet. 

  • A sleeveless jerkin or loose overgarment. 

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