junker vs winter rat

junker

noun
  • A beat-up automobile. 

  • A person with an interest in disused or discarded objects. 

  • Synonym of junkie (“drug addict”) 

  • A young German noble or squire, especially a member of the aristocratic party in Prussia, stereotyped with narrow-minded militaristic and authoritarian attitudes. 

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