grand vizier vs warden

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. 

warden

noun
  • A governing official in various institutions 

  • An official charged with supervisory duties or with the enforcement of specific laws or regulations; such as a game warden or air-raid warden 

  • A variety of pear. 

  • A chief administrative officer of a prison. 

verb
  • To carry out the duties of a warden. 

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