hex vs rune

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. 

rune

noun
  • A verse or song, especially one with mystical or mysterious overtones; a spell or an incantation. 

  • A letter, or character, used in the written language of various ancient Germanic peoples, especially the Scandinavians and the Anglo-Saxons. 

  • A Finnish or Scandinavian epic poem, or a division of one, especially a division of the Kalevala. 

  • A letter or mark used as a mystical or magic symbol. 

  • A Unicode code point. 

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