charabanc vs passenger car

charabanc

noun
  • A horse-drawn, and then later, motorized omnibus with open sides, and often, no roof. 

  • A derisive term for a car, bus, train or other vehicle that is poor quality, slow or overcrowded. 

verb
  • To travel or convey by charabanc. 

passenger car

noun
  • A motor vehicle designed to carry (a few) passengers; a motorcar. 

  • A railroad car designed to carry passengers. 

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