tropical cyclone vs vortex

tropical cyclone

noun
  • a rapidly rotating storm system characterized by a low-pressure center, strong winds, and a circular/spiral arrangement of thunderstorms that produce heavy rain, ranging in increasing strength from tropical depressions and tropical storm to hurricanes. 

  • typhoon, hurricane 

vortex

noun
  • A whirlwind, whirlpool, or similarly moving matter in the form of a spiral or column. 

  • Anything that involves constant violent or chaotic activity around some centre. 

  • Anything that inevitably draws surrounding things into its current. 

  • A supposed collection of particles of very subtle matter, endowed with a rapid rotary motion around an axis which was also the axis of a sun or planet; part of a Cartesian theory accounting for the formation of the universe, and the movements of the bodies composing it. 

  • Any of numerous species of small Turbellaria belonging to Vortex and allied genera. 

verb
  • To mix using a vortex mixer 

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