a person, especially a member of the clergy, who is engaged in conducting religious revivals, which are meetings during which participants form a deep spiritual connection to the object of their faith;
e.g. He had turned into a revivalist, travelling around to organize and lead religious gatherings.
(noun)
a person who is engaged in restoring disused things and brining them back into activity or use;
e.g. She has recently become a revivalist who enjoys giving new life to old and broken furniture.