cowlick vs villus

cowlick

noun
  • An unruly lock or section of hair that sticks straight out from the skull or lies at an angle at odds with the rest of an individual's hair, like a whorl or vortex. 

villus

noun
  • A small projection from a membrane, particularly those found in the mucous membranes of the intestines. 

  • One of the fine soft hairs on fruits, flowers, and other parts of plants. 

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