death penalty vs killing

death penalty

noun
  • A punishment in which the offender is put to death by the state. 

killing

noun
  • An instance of someone being killed. 

  • A large amount of money. 

adj
  • That makes one ‘die’ with laughter; very funny. 

  • That literally deprives of life; lethal, deadly, fatal. 

How often have the words death penalty and killing occurred in a corpus of books? (source: Google Ngram Viewer )