fiacre vs pommel horse

fiacre

noun
  • A small horse-drawn carriage for hire; a hackney carriage. 

pommel horse

noun
  • An athletic event in which the pommel horse is used. 

  • An apparatus for gymnastic exercises with a cylindrical body covered with leather and two upright pommels, as hand grips, near the centre; held upright with adjustable legs. 

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