bellwether vs lodestar

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. 

lodestar

noun
  • A star used as a navigation reference, particularly a pole star such as Polaris. 

  • A guiding tenet or principle. 

  • A calculated amount to award as attorney's fees derived by multiplying the reasonable number of hours spent working on a case by the reasonable hourly billing rate. 

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