autobus vs charabanc

autobus

noun
  • A large group of cyclists who have fallen behind the peloton (“main group of riders”) in a race. 

charabanc

verb
  • To travel or convey by charabanc. 

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

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

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