moisture vs rain

moisture

noun
  • That which moistens or makes damp or wet; exuding fluid; liquid in small quantity. 

  • The state of being moist. 

  • Skin moisture noted as dry, moist, clammy, or diaphoretic as part of the skin signs assessment. 

rain

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

  • Condensed water falling from a cloud. 

  • 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. 

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