rotation vs swirl

rotation

noun
  • The act of turning around a centre or an axis. 

  • The step during takeoff when the pilot commands the vehicle to lift the nose wheel off the ground during the takeoff roll. (see also: V2) 

  • A regular variation in a sequence, such as to even-out wear, or people taking turns in a task; a duty roster. 

  • A single complete cycle around a centre or an axis. 

  • An operation on a metric space that is a continuous isometry and fixes at least one point. 

  • The set of starting pitchers of a team. 

  • Repeated play on a radio station, etc. 

  • The earth's rotation about its axis is responsible for its being slightly oblate rather than a sphere. 

swirl

noun
  • A twist or coil of something. 

  • The upward rushing of a fish through the water to take the bait. 

  • A whirling eddy. 

verb
  • To be arranged in a twist, spiral or whorl. 

  • To circulate. 

  • To twist or whirl, as an eddy. 

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