cumshaw vs extremity

cumshaw

noun
  • A gratuity or tip as thanks for a service 

verb
  • To give or make a present to. 

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 cumshaw and extremity occurred in a corpus of books? (source: Google Ngram Viewer )