batting vs cotton wool

batting

noun
  • Special cotton for surgery. 

  • The action of using a bat. 

  • Cotton, wool, silk or synthetic material used to stuff the inside of a mattress, quilt etc. 

  • The act of someone who bats. 

cotton wool

noun
  • Soft, absorbent cotton for medical or cosmetic use, protective padding, etc. 

  • Raw fibers of cotton before being processed. 

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