house slipper vs moccasin

house slipper

noun
  • A slipper designed to be worn inside the house 

moccasin

noun
  • A traditional Native North American shoe, usually without a heel or sole, made of a piece of deerskin or other soft leather turned up at the edges which are either stitched together at the top of the shoe, or sewn to a vamp (a piece covering the top of the foot). 

  • Any of several North American snakes of the genus Agkistrodon, particularly the copperhead (Agkistrodon contortrix) and the cottonmouth or water moccasin (Agkistrodon piscivorus). 

  • A light beige colour, like that of a moccasin. 

  • A modern shoe with either a low or no heel resembling a traditional Native American moccasin in that the leather forming the sides of the shoe is stitched at the top. 

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