foible vs whimsy

foible

noun
  • A quirk, idiosyncrasy, or mannerism; an unusual habit that is slightly strange or silly. 

  • A weakness or failing of character. 

  • Part of a sword between the middle and the point, weaker than the forte. 

whimsy

noun
  • A quaint and fanciful idea; a whim; playfully odd behaviour. 

  • An impulsive, illogical or capricious character. 

  • A jigsaw puzzle piece that has been cut into a recognizable shape, as if on a whim; often the shape is representative of the theme of the image used for the puzzle. 

  • A whim (capstan or vertical drum). 

verb
  • To fill with whimsies or whims; to make fantastic; to craze. 

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