disperse vs send off

disperse

verb
  • To disseminate. 

  • To break up and disappear; to dissipate. 

  • To scatter in different directions. 

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

  • To distribute throughout. 

adj
  • Scattered or spread out. 

send off

verb
  • To emit; to emanate. 

  • To show someone a red card, and dismiss them from the playing area. 

  • To provide a celebration for someone who is leaving; give a sendoff. 

  • To send; to dispatch. 

noun
  • farewell party 

  • funeral or memorial service 

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