Parapsychology refers to the scientific study of paranormal phenomena. Despite being a relatively niche field, there are several synonyms for the word parapsychology. One such synonym is psychical research, which is used to describe the systematic investigation of paranormal phenomena using scientific methods. Another synonym for parapsychology is paranormal science, which encompasses the study of all mysterious and unexplainable phenomena that fall outside of the scope of traditional scientific inquiry. The term extrasensory perception (ESP) is also often used to describe the study of psychic phenomena, including telepathy, clairvoyance, and precognition. Finally, the word metaphysics can also be used as a synonym for parapsychology, given that it encompasses the study of supernatural and paranormal phenomena.