hurdle vs shifter

hurdle

noun
  • A movable frame of wattled twigs, osiers, or withes and stakes, or sometimes of iron, used for enclosing land, for folding sheep and cattle, for gates, etc.; also, in fortification, used as revetments, and for other purposes. 

  • An artificial barrier, variously constructed, over which athletes or horses jump in a race. 

  • An obstacle, real or perceived, physical or abstract. 

verb
  • To compete in the track and field events of hurdles (e.g. high hurdles). 

  • To overcome an obstacle. 

  • To jump over something while running. 

  • To hedge, cover, make, or enclose with hurdles. 

shifter

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

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

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

  • 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 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 hurdle and shifter occurred in a corpus of books? (source: Google Ngram Viewer )