finale vs irruption

finale

noun
  • The chronological conclusion of a series of narrative works. 

  • The grand end of something, especially a show or piece of music. 

irruption

noun
  • An abrupt increase in the size of a movement or organization. 

  • An abrupt increase of an animal population. 

  • The action of irrupting or breaking into; a violent entry or invasion; an inbreaking; an intrusion. 

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