bellwether vs dean

bellwether

noun
  • Anything that indicates future trends. 

  • A stock or bond that is widely believed to be an indicator of the overall market's condition. 

  • The leading sheep of a flock, having a bell hung round its neck. 

dean

verb
  • To serve as a dean. 

  • To send (a student) to see the dean of a college or university. 

noun
  • A senior official in a college or university, who may be in charge of a division or faculty (for example, the dean of science) or have some other advisory or disciplinary function (for example, the dean of students). 

  • A dignitary or presiding officer in certain church bodies, especially an ecclesiastical dignitary, subordinate to a bishop, in charge of a chapter of canons. 

  • The senior member of some group of people. 

  • A hill. 

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