dare vs riff

dare

verb
  • To terrify; to daunt. 

  • To have enough courage (to do something). 

  • To have enough courage to meet or do something, go somewhere, etc.; to face up to 

  • To catch (larks) by producing terror through the use of mirrors, scarlet cloth, a hawk, etc., so that they lie still till a net is thrown over them. 

  • To defy or challenge (someone to do something) 

noun
  • The quality of daring; venturesomeness; boldness. 

  • A challenge to prove courage. 

  • In the game truth or dare, the choice to perform a dare set by the other players. 

  • A small fish, the dace 

  • Defiance; challenge. 

riff

verb
  • To riffle. 

  • To improvise in the performance or practice of an art, especially by expanding on or making novel use of traditional themes. 

noun
  • A spoof. 

  • A clever or witty remark. 

  • Listen to one of the greatest guitar riffs of all time! 

  • A variation on something. 

  • A repeated instrumental melody line in a song. 

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