faun vs fauna

faun

noun
  • A woodland creature with pointed ears, legs, and short horns of a goat and a fondness for unrestrained revelry. 

  • Any of various nymphalid butterflies of the genus Faunis. 

fauna

noun
  • Animals considered as a group; especially those of a particular country, region, time. 

  • A book, cataloguing the animals of a country. 

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