bearskin vs hearthrug

bearskin

noun
  • The pelt of a bear, especially when used as a rug. 

  • A tall ceremonial hat worn by members of some British regiments for ceremonial occasions; a busby. 

hearthrug

noun
  • A rug placed in front of a fireplace, on the hearth. 

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