witch doctor 
noun
(Among tribal peoples) a magician credited with powers of healing, divination, and protection against the magic of others.The shaman is a witch doctor, a dream reader, and an intermediary (go-between) between the living and the spirit world....
- The village witch doctor or shaman would shake bones while chanting, in the hope of bringing or ending the rains.
- Instead of concluding that the idea that illness is caused by evil spells is nonsense and that the charm is without curative power, the witch doctor explains that the charm did not work because the client did not have enough faith.
Synonyms
medicine man, shaman, healer;
Australian boyla;
in southern Africa sangoma;
in Hawaii kahuna;
in Greenland angekok