At first I didnt know the difference between a Thriller and Horror movie but now I have learnt that there is a big difference between a thriller and horror movie. Thriller mainly focuses on suspense and tension whereas a horror film is trying to elicit fear and disgust from its audience.
Thrillers are based on potential real-life events and monsters. They can be scary and keep you at the edge of your seat but does have a real life theme.
Horror is an extemely broad genre that can range from extreme ore to simply the unexplained.