Shoutbox

Well, by definition:
Similar to horror films, except thrillers use exciting action and tension to engage the audience. Normally referred to as movies where one is on the edge of their seat.

or

A thriller is a novel of suspense with a plot structure that reinforces the elements of gamesmanship and the chase, with a sense of the hunt being paramount. Thrillers can be spy novels, tales of geopolitical crisis, legal thrillers, medical thrillers, technothrillers, domestic thrillers. The common thread is a growing sense of threat and the excitement of pursuit.

So, its an horror film with a lot of suspense.