An investigator is a person who looks into matters and gathers information. A GUMSHOE is a slang term for a detective or private investigator. A REVIEWER is someone who examines something in detail and evaluates it. An INQUIRER is someone who asks questions to gain information. A POLICEMAN is an officer of the law who enforces the law. A plainclothesman is a police officer who does not wear a uniform. A FLATFOOT is another slang term for a police officer. A prober is someone who investigates something in order to find out more about it. A SPY is someone who secretly collects information. A SNOOP is someone who looks around for information, often without permission. A DICK is another slang term for a detective. A REPORTER is someone who collects and reports news. An AUDITOR is someone who examines financial records. An ANALYST is someone who studies data in order to draw conclusions. An INSPECTOR is someone who examines something in order to make sure it meets certain standards. A SEEKER is someone who looks for something. A factfinder is someone who searches for facts.