palanquin vs sedan

palanquin

noun
  • A covered type of litter for a stretched-out passenger, carried on four poles on the shoulders of four or more bearers, as formerly used (also by colonials) in eastern Asia. 

sedan

noun
  • An enclosed windowed chair suitable for a single occupant, carried by at least two porters, in equal numbers in front and behind, using wooden rails that passed through metal brackets on the sides of the chair. 

  • An automobile designed in a configuration with separate compartments for engine space, driver/passenger space and luggage space. 

  • A handbarrow for transporting fish. 

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