hoodoo vs voodooism

hoodoo

noun
  • A practitioner of voodoo. 

  • Supernatural bad luck, or something or someone believed to bring bad luck. 

  • A set of spiritual practices and traditions created and concealed from slave-owners by enslaved Africans in North America, based on traditional African beliefs. 

  • A tall thin spire of rock that protrudes from the bottom of arid basins and badlands. 

verb
  • To jinx; to bring bad luck or misfortune to. 

voodooism

noun
  • Any voodoo practice. 

  • A religious cult, from Haiti, involving witchcraft and sorcery. 

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