quern vs twirl

quern

verb
  • To grind; to use a quern. 

noun
  • A mill for grinding corn, especially a hand-mill made of two circular stones. 

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