cremator vs oil burner

cremator

noun
  • One who, or that which, cremates or consumes to ashes. 

oil burner

noun
  • A heating device which burns fuel oil; an oil furnace. 

  • A machine that uses oil as its fuel. 

  • A device whose operation causes apparent combustion of lubricating oil. 

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