felon vs first-degree murder

felon

noun
  • A person who has committed a felony. 

  • A wicked person. 

  • A bacterial infection at the end of a finger or toe. 

  • A person who has been tried and convicted of a felony. 

adj
  • wicked; cruel 

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 felon and first-degree murder occurred in a corpus of books? (source: Google Ngram Viewer )