bellwether vs coxswain

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. 

coxswain

noun
  • The member of a crew who steers the shell and coordinates the power and rhythm of the rowers. 

  • In a ship's boat, the helmsman given charge of the boat's crew. 

  • A rank or position. 

verb
  • To act as coxswain for. 

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