fire people vs fireman

fire people

noun
  • firefighters, people who have been trained to put out fires 

fireman

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

  • A safety inspector in coal mines. 

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

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

  • 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. 

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