ambassador vs vizier

ambassador

noun
  • A minister of the highest rank sent to a foreign court to represent there his sovereign or country. (Sometimes called ambassador-in-residence) 

  • An official messenger and representative. 

  • A corporate representative, often the public face of the company. 

vizier

noun
  • A high-ranking official or minister in an Islamic government, especially in the Ottoman Empire. 

  • A fairy chess piece that can only be moved one space up, down, left or right. 

  • An ancient Mesopotamian 𒈛 (sukkal). 

  • The highest-ranking official or minister in ancient Egypt or Ebla; a chief administrator or a chancellor. 

  • vicegerent, viceroy 

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