The term "phantom of mind" can refer to various mental experiences, including intrusive thoughts, hallucinations, and delusions. Synonyms for this phrase may depend on the specific type of experience being described. For example, synonyms for intrusive thoughts may include obsessions or unwanted images. Hallucinations may be described as visions or perceptual disturbances. Delusions may be referred to as false beliefs or irrational ideas. Additionally, other related terms may be used, such as mental illusions, cognitive distortions, or mind-tricks. Ultimately, the language used to describe such experiences can vary depending on the context and the individual's interpretation of their mental state.