hardtop vs sedan

hardtop

noun
  • The removable rigid roof of a convertible or sports car. 

  • An indoor cinema with a roof, as opposed to a drive-in. 

  • A car with such a roof. 

sedan

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

  • 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. 

  • A handbarrow for transporting fish. 

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