The word that means the same as the group of words "one who examines accounts officially" is auditor.
An auditor is a person who is qualified to examine the financial records of a company or organization. They are responsible for ensuring that the records are accurate and that the company is complying with all applicable laws and regulations.
The other words in the options have different meanings.
- A collector is a person who collects things, such as stamps or coins.
- An aviator is a pilot.
- A radiator is a device that transfers heat from a liquid to the air.
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