castorette vs facial hair

castorette

noun
  • The fur of a beaver (or of some other animal treated to imitate this fur) 

facial hair

noun
  • Hair on the face of an animal. 

  • Hair on the face of a human, such as the eyebrows of a man or woman or the androgenic hair (beard or moustache) of a man. 

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