contrivance vs machination

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. 

machination

noun
  • A clever scheme or artful plot, usually crafted for evil purposes. 

  • The act of machinating or plotting. 

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