cover story vs ploy

cover story

noun
  • A fictitious account that is intended to hide one's real motive. 

  • A story included in a publication that is highlighted on the front cover. 

ploy

noun
  • A tactic, strategy, or scheme. 

  • Sport; frolic. 

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

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