Do you know ghouls from goblins and ghosts?
c.1600, "high priest," from French pontif (early 16c.), from Latin pontifex, title of a Roman high priest (see pontifex). Used for "bishop" in Church Latin, but not recorded in that sense in English until 1670s, specifically "the bishop of Rome," the pope. Pontifical, however, is used with this sense from mid-15c.