Didn't take long to find out what skribblekid is up to.
"spiky box" looks like a thinly-veiled /d/ comic. dismemberment, choking, splooshing, transformations, all on girls that wear bathing suits that magically go between boobs instead of going across, and wearing high heels in hand-to-hand combat.
To answer OP: I use DM, GM, Director and Narrator interchangably. I sometimes use the term "Referee."
I make a point of avoiding "Storyteller," because that's suggests I'm the only one at the table who is telling the story; that's dismissing the contribution of the other players at the table.