chariot vs driver's compartment

chariot

noun
  • A light (four-wheeled) carriage used for ceremonial or pleasure purposes. 

  • rook 

  • A (two-wheeled) horse-drawn cart, used in Bronze Age and Early Iron Age warfare. 

verb
  • To convey by, or as if by, chariot. 

  • To ride in a chariot. 

driver's compartment

noun
  • Synonym of cab (compartment at the front of a truck or train for the driver). 

How often have the words chariot and driver's compartment occurred in a corpus of books? (source: Google Ngram Viewer )