inactivity vs ploy

inactivity

noun
  • The quality of being inactive; idleness; passiveness. 

ploy

noun
  • Sport; frolic. 

  • A tactic, strategy, or scheme. 

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

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