The fantasy and supernatural film genres are not synonymous with the horror genre, they are more of thriller. I don't think most monster movies were ever considered horror thought some no doubt have called them such. A vampire or zombie film could be made to be horror if it's filmed and scripted right. Resident Evil games had some horror moments, I remember the first one at the beginning where that zombie turns to look at you..good horror moment right there in it's time. But you can make anything scary, a dog, a doll or you can make them into action or comedy just as well.