fireman vs stoker

fireman

noun
  • A person (originally a man) who keeps the fire going underneath a steam boiler (originally, shoveling coal by hand), particularly on a railroad locomotive or steamship. 

  • A safety inspector in coal mines. 

  • An assistant on any locomotive, whether steam-powered or not. 

  • Someone (especially one who is male) who is skilled in the work of fighting fire. 

  • A relief pitcher (reflecting the figurative analogy of rescuing the situation). 

stoker

noun
  • A person who stokes, especially one on a steamship or steam train, who stokes coal in the boilers. 

  • A person who pedals on the back of a tandem bicycle. 

  • A device for stoking a fire; a poker. 

  • A device that feeds coal into a furnace, etc., automatically. 

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