variants:
or advisor
Definition of adviser
: someone who gives advice
a financial/investment adviser She was not signing on as a domestic or foreign-policy adviser …— Peggy Noonan In this meeting, Clifford, who had been a senior Truman aide and an adviser to Kennedy, used George Ball's memorandums in pleading that the war could not be won.— Sidney Blumenthal In December, she and her thesis advisor, Neal Evans, used the camera, attached to a 50-inch telescope, to look for infant stars in a giant molecular cloud in the constellation Orion.— Andrew Chaikin In a real sense, the emperor's astronomical ministers functioned like advisors in a modern president's cabinet, advising him on how best to conduct the affairs of state in a harmonious and effective manner.— Laurence A. Marschall
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Merriam-Webster unabridged
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Time Traveler for adviser
The first known use of adviser was circa 1536
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