auto vs minibus

auto

noun
  • An autorickshaw. 

  • An automobile. 

  • A setting for automatic operation. 

  • A car with an automatic gearbox / transmission. 

  • An automatic gearbox / transmission. 

minibus

noun
  • A small four-wheeled carriage. 

  • A small bus, especially one used as transport for small groups. 

  • A sixteen-seater vehicle used as a taxi. 

  • A combined spending bill for multiple departments that is smaller than an omnibus bill. 

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