peon vs subnormal

peon

noun
  • A person of low rank or importance. 

  • A messenger, foot soldier, or native policeman. 

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

subnormal

noun
  • A person whose abilities are less than normal. 

  • That part of the axis of a curved line which is intercepted between the ordinate and the normal. 

adj
  • denormal 

  • Less than normal. 

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