extremity vs nadir

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. 

nadir

noun
  • The point of the celestial sphere, directly opposite the zenith; inferior pole of the horizon; point of the celestial sphere directly under the place of observation. 

  • The lowest point; time of greatest depression. 

  • The axis of a projected conical shadow; the direction of the force of gravity at a location; down. 

verb
  • To extend (a beehive) by adding an empty box at the base. 

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