My Ten Favorite Terms for GM

Dungeon Master - Dungeons & Dragons

Runemaster - Runequest

Hollyhock God - Nobilis

Ghost Master - Ghostbusters

the Creator - SenZar

Fate - World of Synnibarr

Ninja Master - Night of the Ninja

Excursion Master - Excursion into the Bizarre

the Keeper - Call of Cthulhu

Zombie Master - All Flesh Must Be Eaten

(Of these I have earned the right to call myself by the titles Dungeon Master, Hollyhock God, Ghost Master, and Keeper. I have yet to run the other six games. And I don't own copies of Runequest or Night of the Ninja yet.)