hex vs voodoo

hex

verb
  • To cast a spell on (specifically an evil spell), to bewitch. 

noun
  • A spell (now rare but still found in compounds such as hex sign and hexcraft). 

  • A hexagonal space on a game board. 

  • An evil spell or curse. 

  • A witch. 

  • a hexagon-shaped item of rock climbing equipment intended to be wedged into a crack or other opening in the rock. 

voodoo

verb
  • To bewitch someone or something using voodoo 

noun
  • Any of a group of related religious practices found chiefly in and around the Caribbean, particularly in Haiti and Louisiana. 

  • The spiritual beliefs of the Ewe/Fon of West Africa, practiced chiefly in Benin and in the south of Togo. 

  • Any sort of magical or irrational approach to a problem. 

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