People often have different ways of expressing the same idea. When it comes to the term delusion, some synonyms commonly used are hallucination, illusion, misconception, and fantasy. The word hallucination suggests a false perception of something that is not present, often due to a mental or physical condition. On the other hand, illusion typically refers to a mistaken belief about reality or a distortion of perception. Misconception refers to an incorrect understanding of something, while fantasy implies a fanciful or imagined situation or scenario. These synonyms all describe some form of mental disconnection from reality and can be used interchangeably depending on the context and intended meaning.