bellwether vs chief

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. 

chief

noun
  • A leader or head of a group of people, organisation, etc. 

  • An informal term of address. 

  • The principal part or top of anything. 

  • An informal term of address for a Native American or First Nations man. 

  • The top part of a shield or escutcheon; more specifically, an ordinary consisting of the upper part of the field cut off by a horizontal line, generally occupying the top third. 

adj
  • Primary; principal. 

  • Intimate, friendly. 

verb
  • To smoke cannabis. 

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