brougham vs curricle

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. 

curricle

noun
  • A light two-wheeled carriage large enough for the driver and a passenger and drawn by a carefully-matched pair. 

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