flanker vs stratagem

flanker

noun
  • A fortification or soldier projecting so as to defend another work or to command the flank of an assailing body. 

  • A player who plays in the back row of the scrum. 

  • A wide receiver who lines up behind the line of scrimmage. 

stratagem

noun
  • Specifically, such a tactic or artifice in military operation. 

  • Cunning and artifice in general. 

  • Military deception or artifice. 

  • A tactic or artifice designed to gain the upper hand, especially one involving underhanded dealings or deception. 

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