holocaust vs train wreck

holocaust

verb
  • To destroy (something) completely, especially by fire. 

  • To sacrifice (chiefly an animal) to be completely burned. 

  • To subject (a group of people) to a holocaust (mass annihilation); to destroy en masse. 

noun
  • Complete destruction by fire; also, the thing so destroyed. 

  • An offering or sacrifice to a deity that is completely burned to ashes. 

  • A complete or large offering or sacrifice. 

  • Extensive destruction of a group of animals or (especially) people; a large-scale massacre or slaughter. 

train wreck

verb
  • To ruin utterly and catastrophically, to cause to end in disaster. 

noun
  • The aftermath of a train crash. 

  • A disaster, especially one which is large in scale and readily seen by public observers. 

  • Someone (especially a woman) who is unbalanced and considered a mess, a disaster, one who is suffering personal ruin. 

How often have the words holocaust and train wreck occurred in a corpus of books? (source: Google Ngram Viewer )