Episcopus
Supervisor
Overseer
All have the same denotation (meaning), though they certainly have different connotations.
Episcopus is the Greek for overseer; it is the word Latin uses for bishop.
So you could call a bishop an Overseer or a Supervisor.
Of course, "Overseer" has a negative, Sith-like connotation, almost like "taskmaster". An overseer has to wear a black robe with a hood that hides the face, right?
Just think: your supervisor at work might as well be called your "overseer".
Super = over, above
Visor = seer (one who sees)