rain vs vapor

rain

noun
  • Condensed water falling from a cloud. 

  • Any matter moving or falling, usually through air, and especially if liquid or otherwise figuratively identifiable with raindrops. 

  • An instance of particles or larger pieces of matter moving or falling through air. 

verb
  • To have rain fall from the sky. 

  • To fall as or like rain. 

  • To issue (something) in large quantities. 

vapor

noun
  • Cloudy diffused matter such as mist, steam or fumes suspended in the air. 

  • Something insubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting. 

  • The gaseous state of a substance that is normally a solid or liquid. 

verb
  • To emit vapor or fumes. 

  • To give (someone) the vapors; to depress, to bore. 

  • To become vapor; to be emitted or circulated as vapor. 

  • To turn into vapor. 

  • To use insubstantial language; to boast or bluster. 

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