culpable homicide vs infanticide

culpable homicide

noun
  • Homicide which is culpable but does not rise to the level of murder; unlawful killing of a human being which does not constitute murder. 

  • Used other than figuratively or idiomatically: see culpable, homicide. 

infanticide

noun
  • The criminal offence of killing of a newborn, committed by its mother while psychologically disturbed by the effects of childbirth or lactation, not regarded as murder. 

  • The murderer of a child: a person who has committed infanticide. 

  • The murder of an infant. 

  • The killing of a young, immature animal by a mature adult of the same species. 

  • The murder of a child by a parent; filicide. 

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