extremity vs urgency

extremity

noun
  • A hand or foot. 

  • The most extreme or furthest point of something. 

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

  • An extreme measure. 

urgency

noun
  • Insistence, pressure, urge. 

  • The quality or condition of being urgent. 

  • A sudden and compelling need to urinate that is difficult to defer, associated with conditions such as urinary tract infections and overactive bladder. 

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