accessary vs contrivance

accessary

noun
  • Someone who accedes to some act, now especially a crime; one who contributes as an assistant or instigator to the commission of an offense. 

adj
  • Accompanying as a subordinate; additional; accessory; especially, uniting in, or contributing to, a crime, but not as chief actor. See accessory. 

contrivance

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

  • Something overly artful or artificial. 

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

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