helix vs twirl

helix

noun
  • A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase. 

  • A small volute under the abacus of a Corinthian capital. 

  • The incurved rim of the external ear. 

  • An upside down midair 360° spin in playboating. 

verb
  • To form or cause to form a helix. 

twirl

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

  • A little twist of some substance; a swirl. 

  • Any rotating movement; a spin. 

  • A prison guard. 

verb
  • To twist round. 

  • To pitch. 

  • To rotate rapidly. 

  • To perform a twirl. 

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