disperse vs disseminate

disperse

verb
  • To distribute throughout. 

  • To break up and disappear; to dissipate. 

  • To scatter in different directions. 

  • To disseminate. 

  • To separate rays of light, etc., according to wavelength; to refract. 

adj
  • Scattered or spread out. 

disseminate

verb
  • To become widespread. 

  • To sow and scatter principles, ideas, opinions, etc, or concrete things, for growth and propagation, like seeds. 

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