A psychological horror relies on a character's fears, guilt and belief and emotional instability. The fear comes from the reality of the particular horror.
slasher
This subgenre deals with a lot of violence which usually revolves around a psychotic killer, using a particular weapon such as a knife, chainsaw or some sort of sharp object. This genre is built up on a lot of mystery and suspense and may sometimes overlap with crime films.
Zombie
Zombie horror will usually feature a pandemic or some sort of virus that has caused the zombies. They feed off the living which will make the audience fear those featured on screen.
paranormal
Paranormal horrors try to make the audience fear the unknown, gathering ghosts, demons and possessions. Usually the ghosts are a person from the past angry or coming back for revenge.
Torture porn
Torture Porn is a subgenre that focuses on graphic violence and portrayals of gore very deliberately. through the use of speciel affects these films display the venerability of the human body and the theatricality of its mutilation and torture.