dispersal vs hoarding

dispersal

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

  • A dispersal prison. 

hoarding

noun
  • A good which is hoarded. 

  • An anxiety disorder characterized by a compulsive need to accumulate goods and feelings of anxiety or discomfort about discarding such goods. 

  • A temporary fence-like structure built around building work to add security and prevent accidents to the public. 

  • A roofed wooden shield placed over the battlements of a castle and projecting from them. 

  • A billboard. 

  • The practice by of accumulating goods. 

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