limousine vs winter rat

limousine

noun
  • An automobile with such a body. 

  • A luxury sedan or saloon car, especially one with a lengthened wheelbase or driven by a chauffeur. 

  • An automobile for transportation to or from an airport, including sedans, vans, and buses. 

  • An automobile body with seats and permanent top like a coupe, and with the top projecting over the driver and a projecting front. 

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 limousine and winter rat occurred in a corpus of books? (source: Google Ngram Viewer )