incantation vs mysticism

incantation

noun
  • 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. 

  • Any esoteric command or procedure. 

  • A formula of words used as above. 

mysticism

noun
  • The beliefs, ideas, or thoughts of mystics. 

  • A transcendental union of soul or mind with the divine reality or divinity. 

  • A doctrine of direct communication or spiritual intuition of divine truth. 

  • Obscure thoughts and speculations. 

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