bearskin vs welcome mat

bearskin

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

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

welcome mat

noun
  • Any sign or indication of welcome. 

  • A doormat with a welcoming message on it. 

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