fuzz vs lanugo

fuzz

noun
  • A frizzy mass of hair or fibre. 

  • Quality of an image that is unclear; a blurred image. 

  • A distorted sound, especially from an electric guitar or other amplified instrument. 

  • The police, or any law enforcement agency. 

  • A state of befuddlement. 

  • The random data used in fuzz testing. 

verb
  • To make fuzzy. 

  • To become fuzzy. 

  • To test a software component by running it on randomly generated input. 

lanugo

noun
  • Soft down or fine hair, specifically that covering the human foetus or a tumorous area. 

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