appearance vs illusion

appearance

noun
  • That which is not substance, essence, hypostasis; the outward reality as opposed to the underlying reality 

  • The act of appearing or coming into sight; the act of becoming visible to the eye. 

  • Chiefly used by nurses: the act of defecation by a patient. 

  • The act of appearing in a particular place, or in society, a company, or any proceedings; a coming before the public in a particular character. 

  • An instance of someone coming into a court of law to be part of a trial, either in person or represented by an attorney or such like; a court appearance 

  • A thing seen; a phenomenon; an apparition. 

  • The way something looks; personal presence 

  • Apparent likeness; the way which something or someone appears to others. 

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 appearance and illusion occurred in a corpus of books? (source: Google Ngram Viewer )