ploy vs subterfuge

ploy

noun
  • A tactic, strategy, or scheme. 

  • Sport; frolic. 

verb
  • To form a column from a line of troops on some designated subdivision. 

subterfuge

noun
  • Deception; misrepresentation of the true nature of an activity. 

  • An indirect or deceptive device or stratagem; a blind. Refers especially to war and diplomatics. 

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