collection vs dispersal

collection

noun
  • A set of college exams generally taken at the start of the term. 

  • A set of sets; used because such a thing is in general too large to comply with the formal definition of a set. 

  • The jurisdiction of a collector of excise. 

  • The activity of collecting. 

  • Multiple related objects associated as a group. 

  • The quality of being collected; calm composure. 

  • A gathering of money for charitable or other purposes, as by passing a contribution box for donations. 

  • A set of items or amount of material procured or gathered together. 

  • Debt collection. 

dispersal

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

  • A dispersal prison. 

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