Englishfor English speakers
detective
Noun
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A detective is a person who tries to find information to help people or solve crimes, usually a non-patrol police officer.
He hired a private detective to find the missing art.
Police detectives were examining the house where the body was found.
sergeant
Noun
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A sergeant is a noncomissioned officer in the army, higher in rank than a corporal but lower in rank than a staff sergeant.
She was wearing a huge army overcoat which had sergeant stripes at the shoulder.
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A sergeant is an officer in the police force, higher in rank than a constable but lower than an inspector.
He was a police sergeant with over twenty years experience.