Psychist is a failed attempt to depict a person as a "mind reader". Most probably the combination of the word "psychiatrist" and "psychic." It is the famous saying used by Bhakti Shah as a result of sleep deprivation and excessive g-chatting while studying. (according to Urban Dictionary) However, if you actually meant psychic, it is someone who claims to have an ability to perceive information hidden from the normal senses by using their esp or extrasensory perception. A telepath is one who can do telepathy or can communicate by mind. Fortune teller on the other hand is one who, well, tells you your fortune or predicts information about your life.

There is no such thing as a "psychist". "psychic" = try a dictionary "fortune teller" = try the same dictionary sometimes there's a difference between the two. Sometimes they're the same.