frizz vs lanugo

frizz

noun
  • A mass of tightly curled or unruly hair. 

verb
  • To form into little burs, knobs, or tufts, as the nap of cloth. 

  • To curl; to make frizzy. 

  • Of hair, to form into a mass of tight curls. 

  • To make (leather) soft and of even thickness by rubbing, as with pumice stone or a blunt instrument. 

  • To fry, cook, or sear with a sizzling noise; to sizzle. 

lanugo

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

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