Adviser (noun)

1. A person who gives professional or expert advice.
2. A person who advises or counselors someone.

Origin:

Late middle english: from old french aviser, from avis "advice", based on latin ad- "to" + visare "consider".

Examples:

1. He sought advice from a financial adviser.
2. She is an adviser to the president.
3. The company has several legal advisers.
4. He is an academic adviser to the students.
5. I have an adviser to help me with my studies.