grand vizier vs panjandrum

grand vizier

noun
  • A figure of great authority and power. 

  • The greatest minister of a sultan, with absolute power of attorney and, in principle, dismissable only by the sultan himself. 

panjandrum

noun
  • An important, powerful or influential person. 

  • A self-important or pretentious person. 

  • A massive, rocket-propelled, explosive-laden cart designed by the British military during World War II. 

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