allot vs disperse

allot

verb
  • To distribute or apportion by (or as if by) lot. 

  • To assign or designate as a task or for a purpose. 

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. 

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