derm vs fur coat

derm

noun
  • The integument of animal; the skin. 

  • Synonym of dermis. 

  • Guts, entrails. 

fur coat

noun
  • The fur of an animal; the animal coat of its own fur. 

  • An outer garment for the upper body made of furry animal hides. 

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