consultant

US /kənˈsʌltənt/

・

UK /kən'sʌltənt/

Expert who gives (paid) advice
A person who provides expert advice professionally.
A senior doctor in a hospital who specializes in a particular field.
A person or company whose job is to give advice on a particular subject to a business.
A person who provides expert advice on information technology.
A person who provides expert advice on educational matters.
A person who provides expert advice professionally.
A specialist who gives professional advice or services.

Examples

We brought in a management consultant to sort out the mess.

He was happy to act as a consultant to the company.