Beetle vs dinger

Beetle

noun
  • A small car, the Volkswagen Beetle (original version made 1938–2003, similar models made 1997–2010 and since 2011). 

dinger

noun
  • An unregistered car. 

  • The suspended clapper of a bell. 

  • A condom. 

  • Something outstanding or exceptional, a humdinger. 

  • A home run. 

  • One who rings a bell. 

  • A catapult, a shanghai. 

  • A bell or chime. 

  • The penis. 

  • The buttocks, the anus. 

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