fetish vs hobby horse

fetish

noun
  • Something which is believed to possess, contain, or cause spiritual or magical powers; an amulet or a talisman. 

  • Sexual attraction to or arousal at something abnormally sexual or nonsexual, such as an object or a nonsexual part of the body. 

  • An irrational, or abnormal fixation or preoccupation; an obsession. 

hobby horse

noun
  • A child's toy consisting of a (usually wooden or cloth) horse's head mounted on a stick. 

  • A topic about which someone loves to talk at great length. 

  • The Irish hobby, an extinct breed of horse. 

  • A puppet-like costume used in some traditional dances and festivals that gives its wearer the appearance of a man on horseback. 

  • An early bicycle with no pedals or brakes; a draisienne. 

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