Mountain vs shifter

Mountain

noun
  • a steam locomotive of the 4-8-2 wheel arrangement. 

name
  • A surname. 

  • A village in North Dakota, United States. 

  • The Montagnard party in the time of the French Revolution. 

  • A town in Wisconsin, United States. 

shifter

noun
  • A switcher or shunter: a railroad locomotive used for shunting. 

  • A word whose meaning changes depending on the situation, as by deixis. 

  • One who, or that which, shifts or changes. 

  • An assistant to the ship's cook in washing, steeping, and shifting the salt provisions. 

  • A component used by the rider to control the gearing mechanisms and select the desired gear ratio, usually connected to the derailleur by a mechanical actuation cable. 

  • An arrangement for shifting a belt sidewise from one pulley to another. 

  • A genre of erotica focusing on lycanthropes or other shapeshifters, such as werewolves. 

  • A spanner with an adjustable jaw size. 

  • A person who changes the reality their consciousness resides in, through meditation or other means. 

  • A wire for changing a loop from one needle to another, as in narrowing, etc. 

  • A person employed to repair the horseways and other passages, and keep them unobstructed. 

  • A shape-shifter, or a person or other being capable of changing their physical form. 

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