roadster vs two-seater

roadster

noun
  • An open automobile having a front seat and a rumble seat. 

  • A person who lives along the road. 

  • a sea-going vessel riding at anchor in a road or bay. 

  • A clumsy vessel that works its way from one anchorage to another by means of the tides. 

  • A bicycle, or tricycle, adapted for common roads, rather than for the racing track, usually of classic style and steel-framed construction. 

two-seater

noun
  • A vehicle with seats for two people (a driver or pilot and one passenger) 

How often have the words roadster and two-seater occurred in a corpus of books? (source: Google Ngram Viewer )