roadster vs runabout

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. 

runabout

noun
  • A light, open, American horse-drawn vehicle with four large wheels. 

  • Any of several small vehicles, especially a small motor car for use on short journeys. 

  • A small, relatively maneuverable spacecraft or shuttlecraft. 

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