Perceptional misinterpretation of a real object is
Illusion: Perceptual misinterpretation of a real external stimulus. Reference: Kaplan & Sadock's Synopsis of Psychiatry: Behavioral Sciences/Clinical Psychiatry, 11th Edition, page 1413.
Hallucination
Schizophrenia
Illusion
Delusion
Symptoms and signs in psychiatry and classification