cowlick vs sideburn

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. 

sideburn

noun
  • The unwanted rapid burning down one side of a cigarette that has been ineptly rolled. 

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