impulse vs whimsy

impulse

noun
  • A wish or urge, particularly a sudden one prompting action. 

  • A thrust; a push; a sudden force that impels. 

  • The integral of force over time. 

verb
  • To impel; to incite. 

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 impulse and whimsy occurred in a corpus of books? (source: Google Ngram Viewer )