illusion vs invention

illusion

noun
  • A magician’s trick. 

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

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

  • The state of being deceived or misled. 

invention

noun
  • Something invented. 

  • The capacity to invent. 

  • The act of inventing. 

  • A small, self-contained composition, particularly those in J.S. Bach’s Two- and Three-part Inventions. 

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