birl vs twirl

birl

verb
  • To spin. 

  • To cause (a floating log) to rotate by treading on it. 

  • To throw down a coin as one's share in a joint contribution. 

noun
  • A type of grace note movement that quickly switches between low-A and low-G several times, producing a low rippling sound. 

  • A girl of boyish appearance. 

twirl

verb
  • To twist round. 

  • To pitch. 

  • To rotate rapidly. 

  • To perform a twirl. 

noun
  • A little twist of some substance; a swirl. 

  • A movement where a person spins round elegantly; a pirouette. 

  • Any rotating movement; a spin. 

  • A prison guard. 

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