Psychic is a synonym of diviner.
As nouns the difference between psychic and diviner
is that
psychic is a person who possesses, or appears to possess, extra-sensory abilities such as precognition, clairvoyance and telepathy, or who appears to be susceptible to paranormal or supernatural influence while
diviner is one who foretells the future.
As an adjective psychic
is relating to the abilities of a psychic.