charabanc vs perambulator

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. 

perambulator

noun
  • A baby carriage. 

  • A surveyor's instrument for measuring distances, consisting of a wheel that rolls over the ground, along with a clockwork apparatus and a dial plate upon which the distance travelled is shown by an index. 

  • One who perambulates. 

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