batt vs cotton wool

batt

noun
  • Pieces of fabric or fibre used for stuffing; as for batting or insulation 

  • A shoe. 

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 batt and cotton wool occurred in a corpus of books? (source: Google Ngram Viewer )