alchemy vs illusion

alchemy

noun
  • The causing of any sort of mysterious sudden transmutation. 

  • Any elaborate transformation process or algorithm. 

  • The premodern and early modern study of physical changes, particularly in Europe, Arabia, and China and chiefly in pursuit of an elixir of immortality, a universal panacea, and/or a philosopher's stone able to transmute base metals into gold, eventually developing into chemistry. 

illusion

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

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

  • A magician’s trick. 

  • The state of being deceived or misled. 

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