execution vs first-degree murder

execution

noun
  • The act of putting to death or being put to death as a penalty, or actions so associated. 

  • The carrying out of an instruction, program or program segment by a computer. 

  • The act, manner or style of executing (actions, maneuvers, performances). 

  • The carrying into effect of a court judgment, or of a will. 

  • The formal process by which a contract is made valid and put into binding effect. 

  • The state of being accomplished. 

first-degree murder

noun
  • An act that constitutes the crime of first-degree murder. 

  • The criminal offence of murder in a form considered by law to be the most serious; the precise distinction may vary by jurisdiction but typically involves premeditation, or the choice of victim or other circumstances being regarded as especially blameworthy. 

How often have the words execution and first-degree murder occurred in a corpus of books? (source: Google Ngram Viewer )