hardtop vs junker

hardtop

noun
  • The removable rigid roof of a convertible or sports car. 

  • An indoor cinema with a roof, as opposed to a drive-in. 

  • A car with such a roof. 

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. 

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