The term 'nonexistent' is used to describe something that does not exist or is not real. It can be used to describe a variety of things, including CHIMERICAL (10 letters), MYTHICAL (8 letters), LEGENDARY (9 letters), FAKE (4 letters), NIL (3 letters), and NULL (4 letters). CHIMERICAL refers to something that is impossible or fanciful, MYTHICAL refers to something that is based on a myth or legend, LEGENDARY refers to something that is famous and well-known, FAKE refers to something that is not genuine or authentic, NIL refers to something that is nonexistent or nothing, and NULL refers to something that is invalid or without value. All of these terms are used to describe something that does not exist or is not real.