beating vs pitter-patter

beating

noun
  • The action by which someone or something is beaten. 

  • A heavy defeat or setback. 

  • The pulsation of the heart. 

pitter-patter

noun
  • A soft, percussive sound, as of tiny feet, or of rain on a rooftop. 

How often have the words beating and pitter-patter occurred in a corpus of books? (source: Google Ngram Viewer )