contrivance vs stratagem

contrivance

noun
  • Something overly artful or artificial. 

  • A means, such as an elaborate plan or strategy, to accomplish a certain objective. 

  • A (mechanical) device to perform a certain task. 

stratagem

noun
  • 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. 

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

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