ranger vs signaller

ranger

noun
  • One who ranges; a rover. 

  • A roving robber; one who seeks plunder. 

  • In some modern armies, an elite soldier, similar to special forces but often operating in larger units. 

  • A character skilled in the use of ranged weapons. 

  • A keeper, guardian, or soldier who ranges over a region (generally of wilderness) to protect the area or enforce the law. 

  • A dog that beats the ground in search of game. 

  • A warrior character, often with wilderness and stealth skill, who typically travels the countryside. 

verb
  • To work as a ranger. 

signaller

noun
  • One who signals. 

  • synonym of signalman 

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