flat tyre vs moccasin

flat tyre

noun
  • The result of stepping on the back of another individual's shoe in an accidental act, or deliberately to bully or tease this person, so as to cause the back of the shoe to collapse under the heel. 

  • A tyre of a motor vehicle that is deflated, especially one deflated because of a puncture when in use. 

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 flat tyre and moccasin occurred in a corpus of books? (source: Google Ngram Viewer )