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

The man supervising the exam had a huge moustache.

Invigilator

The one-word substitute for the underlined group of words "The man supervising the exam" is invigilator.

• Examiner is a person who sets and marks exams.
• Curator is a person who takes care of a museum or art gallery.
• Controller is a person who controls or directs something.

The word invigilator comes from the Latin word "invigilare," meaning "to watch over." An invigilator is a person who supervises an exam to ensure that it is conducted fairly and that there is no cheating. They are usually responsible for checking that the candidates have the correct identification, that they are not using any unauthorized materials, and that they are not communicating with each other.