Different sub-genres of thrillers

1. Eco-Thriller: In this sub genre, the protagonist must stop an ecological threat tot he environment that had negative consequences for society. The protagonist usually has to fight the people responsible for causing the calamity. Examples: The Day the Earth Stood Still, the Day After Tomorrow, I am Legend.
2. Psychological-Thriller: In this sub genre, the conflict is suspenseful, emotional and mental rather than physical. The protagonist may become involved in a situation that threatens their sanity. Examples: Memento, Rear Window, Taxi Driver.
3. Supernatural-Thriller: In this sub genre, otherworldly elements are introduced- usually the antagonist or the protagonist (or both) have supernatural powers. Examples: Aliens, Inception, District 9.
4. Crime-thriller: This sub genre focuses on crime and usually includes physical action. It can be from the point of view of the criminal, the police or a witness to a crime. Examples: The Usual Suspects, The Fugitive, Pulp Fiction.
5. Romantic-Thriller: The plot line of this genre follows the tension, suspense and excitement of a thriller but the main focus id the growing relationship between two characters (usually the protagonists). Examples: Sleeping With the Enemy, Mr and Mrs Smith, Safe Haven.
6. Conspiracy-Thriller: The protagonist is forced to face a confrontation with a large powerful organisation alone because only they can see the threat of them. Examples: Conspiracy Theory, The Bourne Identity, Angles and Demons. 
7. Forensic-Thriller: In this sub-genre, the protagonists are forensic scientists and their involvement in an unsolved crime threatens their lives.