Inspector
Part of speech: noun
Definition: a person employed to inspect something a police officer ranking below superintendent
Example sentence: The casting of 'Slumdog Millionaire' is a dream. Anil Kapoor, as the sleazy TV host, diamonds winking in his earlobes, has never been better; the quietly understated Irrfan Khan turns in another bravura performance as the police inspector whose questioning brings out Jamal's story.
Examiner
Part of speech: noun
Definition: A person who investigates someone or something.