birr vs twirl

birr

verb
  • To lurch or set to spinning. 

  • To make a whirring noise; make a noise like that of revolving wheels, or of millstones at work. 

noun
  • The currency of Ethiopia, divided into 100 santims. 

  • A strong trilling. 

  • The force of movement; rush, impetus, momentum, driving force 

  • A whirring noise 

  • strength, vigor, energy 

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 birr and twirl occurred in a corpus of books? (source: Google Ngram Viewer )