cooling vs refrigeration

cooling

noun
  • Refrigeration. 

  • A decrease in temperature. 

adj
  • That cools. 

  • . Of food or medicine, according to traditional Chinese medicine: serving to cool or calm the body. 

refrigeration

noun
  • The process of preserving something by cooling. 

  • The process of transferring heat from an object in order to cool it. 

  • The cooling of the body for therapeutic purposes. 

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