gendarme vs sapper

gendarme

noun
  • A member of the gendarmerie, a military body charged with police duties. 

  • A policeman. 

  • A rock pinnacle on a mountain ridge. 

sapper

noun
  • An officer or private of the Royal Engineers. 

  • Historical term for a combat engineer that is still used in some armies, in other words an engineer or a soldier engaged in attacking, destroying, and circumventing or building fortifications, bridges, and roads; a military engineer active in a combat zone. 

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