foyer vs mudroom

foyer

noun
  • A lobby, corridor, or waiting room, used in a hotel, theater, etc. 

  • A hostel offering accommodation and work opportunities to homeless young people. 

  • The crucible or basin in a furnace which receives the molten metal. 

mudroom

noun
  • A room used as a barrier between outdoors and indoors. 

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