appendage vs extremity

appendage

noun
  • An external body part that projects from the body. 

  • A part that is joined to something larger. 

  • A natural prolongation or projection from a part of any organism. 

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. 

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