landau vs tilbury

landau

noun
  • A type of lightweight, four-wheeled carriage in which the front and back passenger seats face each other. 

  • A style of automobile based around the design of landau carriages. 

tilbury

noun
  • A small open two-wheeled carriage. 

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