A Horror is defined as: anything that causes such a feeling: killing, looting, and other horrors of war.
A Thriller is defined as: an exciting, suspenseful play or story, especially a mystery story.
A thriller movie such as 'Taken' contains the potential of death as well a suspense build up. The audience are allowed to know the full story before something thrilling occurs.
A horror movie like SAW is much more bloody and gory and not for the faint hearted
most Thriller movies have an age certificate of 15
Most Horror movies have an age certificate of 18