fetish vs obsession

fetish

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

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

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

obsession

noun
  • An idea that engenders a compulsive or irrational preoccupation, or the preoccupation thereby engendered. 

  • The quality of being obsessed. 

  • Influence or control by evil spirits without possession. 

  • An activity or entity that inspires a compulsive and potentially unhealthy fixation, or the fixation thereby inspired. 

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