brougham vs coach driver

brougham

noun
  • A four-wheeled horse-drawn carriage, designed in 1839. It had an open seat for the driver in front of the closed cabin for two or four passengers. 

  • An automobile, a sedan without a roof over the driver's seat. 

coach driver

noun
  • A person driving a horse-drawn coach (carriage). 

  • A person employed to drive a coach (long-distance bus). 

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