pod vs winter rat

pod

noun
  • A small vehicle, especially used in emergency situations. 

  • A lie-flat business or first class seat. 

  • A small section of a larger office, compartmentalised for a specific purpose. 

  • A subsection of a prison, containing a number of inmates. 

  • A seed case for legumes (e.g. peas, beans, peppers); a seedpod. 

  • A group of whales, dolphins, seals, porpoises or hippopotami. 

  • A nicotine cartridge. 

verb
  • To swell or fill. 

  • To remove peas from their case. 

  • To put into a pod or to enter a pod. 

  • To bear or produce pods 

winter rat

noun
  • An old, unattractive automobile, purchased for little money, to be driven during brutal Great Lakes winters while the owner's "good" car remains garaged and protected from corrosive road salt for the season. 

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