chauffeur vs pilot burner

chauffeur

noun
  • The driver of a fire truck. 

  • A person employed to drive a private motor car or a hired car of executive or luxury class (like a limousine). 

verb
  • To be, or act as, a chauffeur (driver of a motor car). 

  • To transport (someone) in a motor vehicle. 

pilot burner

noun
  • Synonym of pilot light (“persistent flame to ignite gas”) 

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