アドバイザー
also: アドバイザ · アドヴァイザー · アドバイサー
Usage patterns
〈人〉のアドバイザーを務めるto serve as someone's adviser
He serves as an adviser to the new employees.
アドバイザーに相談するto consult an adviser
I consulted a specialist adviser about the investment.
〈事〉についてアドバイザーを頼むto ask an adviser for help on a matter
I decided to ask an adviser for help about studying abroad.