infantier vs peon

infantier

noun
  • A soldier in the infantry; an infantryman. 

peon

noun
  • A messenger, foot soldier, or native policeman. 

  • A person of low rank or importance. 

  • A lowly person; a peasant or serf; a labourer who is obliged to do menial work. 

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