Ok, tony. I'll play. Let me through out some common sub-genres of horror:
- Flesh Eaters (which can be broken into 2 groups)
- Exploitation
- Erotic Horror
- Gore/Extreme/Splatter (so many names, but you know the type of film)
- Gothic Horror
- Psychological Horror
- Sci-fi Horror
- Slasher (most of the movies that have more than 5 sequels fit here)
- Supernatural (lets break this one down even further)
- Ghosts
- Demonic
- Monsters
- Witches/Warlocks
- Vampires
- Vomit Horror (yuck!)
Ok.....this could quickly become a friggin' doctoral dissertation, so I will quit now. I'm sure others can add to this. :)