constable vs fireman

constable

noun
  • The warden of a castle. 

  • An elected or appointed public officer, usually at municipal level, responsible for maintaining order or serving writs and court orders. 

  • One holding the lowest rank in most Commonwealth police forces. (See also chief constable.) 

  • An officer of a noble court in the Middle Ages, usually a senior army commander. (See also marshal). 

  • A police officer or an officer with equivalent powers. 

  • An elected head of a parish (also known as a connétable) 

  • A large butterfly, Dichorragia nesimachus, family Nymphalidae, of Asia. 

fireman

noun
  • 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). 

  • 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 constable and fireman occurred in a corpus of books? (source: Google Ngram Viewer )