serial killer vs suicide

serial killer

noun
  • A person who commits multiple (more than two) murders, especially similar ones with no obvious motive over a period of time with a "cooling-off" period between each murder. 

suicide

noun
  • A particular instance of a person intentionally killing themself, or of multiple people doing so. 

  • A diabolo trick where one of the sticks is released and allowed to rotate 360° round the diabolo until it is caught by the hand that released it. 

  • Intentional killing of oneself. 

  • A run comprising a series of sprints of increasing lengths, each followed immediately by a return to the start, with no pause between one sprint and the next. 

  • Pertaining to a suicide bombing. 

  • A beverage combining all available flavors at a soda fountain. 

  • A children's game of throwing a ball against a wall and at other players, who are eliminated by being struck. 

  • A person who has intentionally killed themself. 

  • An action that could cause the literal or figurative death of a person or organization, although death is not the aim of the action. 

verb
  • To self-destruct. 

  • To kill (someone) and make their death appear to have been a suicide rather than a homicide (now especially as part of a conspiracy). 

  • To kill oneself intentionally. 

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