extremity vs proper right

extremity

noun
  • The most extreme or furthest point of something. 

  • A hand or foot. 

  • A limb (“major appendage of a human or animal such as an arm, leg, or wing”). 

  • An extreme measure. 

proper right

noun
  • The direction which is to the right from an object's perspective, the direction 90 degrees clockwise from the front. 

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