A security agent is someone or something that has been employed to protect the assets of a business or company. They can be found everywhere, from small corner shops to large international airports. They're also commonly known to wear black clothing and will generally have some form of security ID on them.
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a double agent a double agent
There is no actual opposite for the noun agent (representative, envoy).
security
There is no full form of security guard. You can have a private security guard.
US Border Patrol agent