dispersal vs ending

dispersal

noun
  • The act or result of dispersing or scattering; dispersion. 

  • A dispersal prison. 

ending

noun
  • A termination or conclusion. 

  • The last part of something. 

  • The last morpheme of a word, added to some base to make an inflected form (such as -s in "dogs"). 

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