troop ‧ er /ˈtruːpə $ -ər/ BrE AmE noun
1 . [countable] a soldier of the lowest rank in the part of the army that uses ↑ tank s or horses
2 . [countable] a member of a state police force in the US
3 . swear like a trooper old-fashioned to swear a lot
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THESAURUS
■ people in the police
▪ police officer ( also officer ) a member of the police. In British English, police officer is used especially in more formal contexts, for example in news reports. In everyday English, British people still usually say policeman or policewoman :
a senior police officer
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He was sentenced to life in prison for killing a police officer.
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He is the officer in charge of the case.
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Officer Fayard (=in the US ‘Officer’ is used in the title of police officers)
▪ policeman a man who is a member of the police:
an off-duty policeman
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He’s a former policeman.
▪ policewoman a woman who is a member of the police:
The girl, accompanied by a policewoman and two social workers, was seen in private by Sheriff George Crozier.
▪ PC/WPC abbreviation used in the job titles of British police offiicers. PC means ‘Police Constable’ and WPC means 'Woman Police Constable':
PC Keith Fletcher
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WPC Susan Larkin
▪ detective a police officer whose job is to discover who is responsible for crimes:
Detectives are investigating the death of a baby boy.
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Detective Inspector John Hartwell
▪ plain-clothes adjective a plain-clothes police officer wears ordinary clothes instead of a uniform:
Two plain-clothes police officers, acting as hotel security men, kept watch on him.
▪ constable a British police officer of the lowest rank:
a police constable
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Constable Robin Cameron
▪ chief constable a senior police officer who is in charge of the police in a particular area in Britain:
the chief constable of North Yorkshire police
▪ cop informal a police officer:
You’d better call the cops.
▪ trooper a US police officer in a state police force:
a New Jersey state trooper