ork vs pixie

ork

noun
  • A species of aggressive, fungal humanoid alien, corresponding to the orcs in other fantasy works. 

  • Alternate spelling of orc. 

pixie

noun
  • A playful sprite or elflike or fairy-like creature. 

  • A butterfly of the genus Melanis. 

  • A cute, petite woman with short hair. 

  • An upper-atmospheric optical phenomenon associated with thunderstorms, a short-lasting pinpoint of light on the surface of convective domes that produces a gnome. 

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