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Examiner

//əɡˈzæmɪnɚ// noun

Noun

1
A person who investigates someone or something.
"Younger [Customs] examiners, who, perhaps, have not yet acquired the intuition resulting from years of experience, seem partly responsible for the closer examination of incoming luggage. Not only is this closer scrutiny arousing feelings of resentment among passengers, but it is causing serious delays in the departure of boat trains, many of which have been reaching their destinations two or three hours late."
2
an investigator who observes carefully wordnet
3
A person who sets an examination.
4
someone who administers a test to determine your qualifications wordnet
5
A person who marks an examination.

From examine + -er.

Unscramble this word: examiner