apocalypse vs judgement day

apocalypse

noun
  • The unveiling of events prophesied in the Revelation; the second coming and the end of life on Earth; global destruction. 

  • The Book of Revelation. 

  • A disaster; a cataclysmic event; destruction or ruin. 

  • A revelation, especially of supernatural events. 

judgement day

noun
  • The Last Judgment, Final Judgment, final trial of all humankind, both the living and dead by God expected to take place at the end of the world, when each is rewarded or punished according to his or her merits. 

How often have the words apocalypse and judgement day occurred in a corpus of books? (source: Google Ngram Viewer )