Torturer (noun)

A person who inflicts severe physical or mental pain on others, as a punishment or to force a confession or information.

Origin:

From the latin word "tortura" meaning "torture" and the suffix "-er" meaning "one who does something".

Examples:

1. The dictator's regime was known for its use of torturers.
2. The torturer used waterboarding as a means of interrogation.
3. The prison was run by a sadistic torturer who enjoyed inflicting pain on the prisoners.
4. The torturers were trained in various methods of inflicting pain.
5. He was accused of being a torturer during the war crimes tribunal.