What is a Horror/ Thriller ?

Conventions of a Horror Movie or Horror Iconography

Here I have made a list of things and feelings that we associate with Horror Films that scare us:
Blood
Suspense
Screaming
Death
A Weapon - An Axe
A Fear - Spiders
Contrapuntal Music - Disjointed Music
Usually at night time
Secluded area
Creepy House
Pain
Bad Weather
Psycopath
Horrible noises - screaching
Small confined spaces
Bent trees - no leaves
Someones always alone
Massacre
Black cats
Protagonist
Antagonist
Black magic
Ghost's
Chase sequences
Swamps
Faulty lights
A woman always dies first ( we see this clearly in Scream, when the blond girl is murdered at the beginning)
Inept police
Scary children
Dolls
Clowns
Delapadated buildings
Cars breaking down