facade vs illusion

facade

noun
  • A deceptive or insincere outward appearance. 

  • An object serving as a simplified interface to a larger body of code, as in the facade pattern. 

  • The face or front (most visible side) of any other thing, such as an organ. 

  • The face of a building, especially the front view or elevation. 

illusion

noun
  • The state of being deceived or misled. 

  • 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. 

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