cotton wool vs filling

cotton wool

noun
  • Raw fibers of cotton before being processed. 

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

filling

noun
  • The woof in woven fabrics. 

  • A religious experience attributed to the Holy Ghost "filling" a believer. 

  • The contents of a pie, etc. 

  • Anything that is used to fill something. 

  • Any material used to fill a cavity in a tooth or the result of using such material. 

  • Prepared wort added to ale to cleanse it. 

adj
  • Of food, that satisfies the appetite by filling the stomach. 

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