ploy vs surreptitiousness

ploy

noun
  • A tactic, strategy, or scheme. 

  • Sport; frolic. 

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

surreptitiousness

noun
  • The state or quality of being surreptitious. 

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