illusion vs voodooism

illusion

noun
  • A magician’s trick. 

  • A misapprehension; a belief in something that is in fact not true. 

  • Anything that seems to be something that it is not. 

  • The state of being deceived or misled. 

voodooism

noun
  • Any voodoo practice. 

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

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