Differences between horrors and thrillers

HORROR
Definition: Horrow films are movies that strive to elicit the emotions of fear, horror and terror from the viewer.
Horror film examples: Scream, 28 Days Later, Mum&Dad, Dead Silence and Candyman.
Typical Horror conventions: the death rate is often higher, the antagonist usually has no reason for killing and blood and gore is in abundance.

THRILLER
Definition: Thrillers films are fast paced, often action packed.
Thriller film examples: Premonition, Frightners, White Noise, American Psycho, and Saw 1.
Typical Thriller conventions: Fast paced, frequent action and resourceful heros who must defile the plans of more powerful and better equiped villians. the antagonist usually has a motive, murders are more thought out and ussually have reason.
Lighting is often used to set the atmosphere and the music is also a fitting role in creating an effective thriller.