dispersal vs marshalling

dispersal

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

  • A dispersal prison. 

marshalling

noun
  • The process of transforming the memory representation of an object to a data format suitable for storage or transmission, which is typically used when data must be moved between different parts of a computer program, or from one program to another. 

  • The arrangement of an escutcheon to exhibit the alliances of the owner. 

  • The sorting of rolling stock in a marshalling yard. 

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