hex vs incantation

hex

noun
  • An evil spell or curse. 

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

  • A hexagonal space on a game board. 

  • A witch. 

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

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

incantation

noun
  • Any esoteric command or procedure. 

  • A formula of words used as above. 

  • The act or process of using formulas and/or usually rhyming words, sung or spoken, with occult ceremonies, for the purpose of raising spirits, producing enchantment, or creating other magical results. 

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