Well, psychic ability is simply a skill, or ability. Just as someone may have an ability to sing, play the piano, play football, run a race etc. Such a person could be involved with spells, curses etc. One could also be a saint and be very psychic. Much of the Christian bible talks about people with psychic abilities.
Spirituality however is a totally different thing.
One can be very un-spiritual, evil if you like, and be very psychic. People that fit this description may, or may not, be psychic. So the two terms are definitely NOT interchangeable. I don't think so. Because you probably realize that singing ability has nothing to do with spirituality.