coo vs cooling

coo

adj
  • Cool. 

verb
  • To speak in an admiring fashion, to be enthusiastic about. 

  • To make a soft murmuring sound, as a pigeon. 

intj
  • An expression of approval, fright, surprise, etc. 

noun
  • The murmuring sound made by a dove or pigeon. 

  • An expression of pleasure made by a person. 

cooling

adj
  • That cools. 

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

noun
  • A decrease in temperature. 

  • Refrigeration. 

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