compression vs dispersal

compression

noun
  • The cycle of an internal combustion engine during which the fuel and air mixture is compressed. 

  • An increase in density; the act of compressing, or the state of being compressed; compaction. 

  • The electronic process by which any sound's gain is automatically controlled. 

  • The deviation of a heavenly body from a spherical form. 

  • The process by which data is compressed. 

dispersal

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

  • A dispersal prison. 

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