first-degree murder vs homicide

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. 

homicide

noun
  • A victim of homicide; a person who has been unlawfully killed by someone else. 

  • The department within a police force that investigates cases of homicide. 

  • The killing of one person by another, whether premeditated or unintentional. 

  • A person who kills another. 

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