fob vs keyholder

fob

noun
  • A hand-held remote control device used to lock/unlock motor cars etc. 

  • A little pocket near the waistline of a pair of trousers or in a waistcoat or vest to hold money or valuables, especially a pocketwatch. 

  • A short chain or ribbon to connect such a pocket to the watch. 

  • A small ornament attached to such a chain. 

keyholder

noun
  • A device or component for holding a key. 

  • The individual or organisation with access to a cryptographic key. 

  • A dominant partner who controls whether their submissive partner is able or allowed to orgasm or receive sexual stimulation, typically by locking the submissive partner in a chastity belt or chastity cage. 

  • One who holds the key to a building etc. for security reasons. 

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