Usually I call them demons because of the bright and red hellish color schemes, zombies are usually desaturated colors and green. And the fake village created usually can only be done by means of black magic which Hell is powerful to cast that. Zombies? Not so much other than just mindless brain eaters.
Suit yourself, I think I know one theory, zombie is a more famous word. Demons normally easier to spell and pronounce, but which evil creatures has a better fame, the other is being vampires of course.
And that's how people think it this way and call them zombies. Let's not forget Harry Potter's 1st movie, the title has conflict for simplicity as well between veteran fans and kids.