disperse vs occlusive

disperse

adj
  • Scattered or spread out. 

verb
  • 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. 

  • To distribute throughout. 

occlusive

adj
  • That tends to occlude. 

noun
  • A product that forms a protective film and traps moisture against the skin. 

  • A phoneme produced by obstructing airflow in the vocal tract, but not necessarily in the nasal tract. 

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