lanugo vs stubble

lanugo

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

stubble

noun
  • Short, coarse hair, especially on a man’s face. 

  • The short stalks left in a field after crops have been harvested. 

verb
  • To produce a crop in a field of stubble that remains after a preceding crop is removed, either by sowing a second crop or by allowing shoots to sprout from the roots of the stubble. 

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