Select the option that can be used as a one-word substitute for the given group of words.

One who supervises students in an examination hall

Invigilator

The option that can be used as a one-word substitute for "one who supervises students in an examination hall" is invigilator.

• Invigilator means a person who supervises an examination or test, especially to ensure that no cheating takes place.
• Inspector means a person who examines or investigates something, especially to ensure that it is in accordance with the rules.
• Examinee means a person who is taking an examination or test.
• Teacher means a person who teaches, especially in a school or college.