auto vs ragtop

auto

noun

  • An automobile. 

  • An autorickshaw. 

  • A setting for automatic operation. 

  • A car with an automatic gearbox / transmission. 

  • An automatic gearbox / transmission. 

ragtop

noun

  • A convertible automobile. 

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