fiacre vs landau

fiacre

noun
  • A small horse-drawn carriage for hire; a hackney carriage. 

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. 

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