counsellor

Concise Oxford English Dictionary © 2008 Oxford University Press:
counsellor /ˈkaʊnsələ(r)/ (US counselor)

▶noun

• 1 a person trained to give guidance on personal, social, or psychological problems.

• 2 a senior officer in the diplomatic service.

• 3 (also counselor-at-law) US & Irish a barrister.

usage: The words counsellor and councillor are often confused. A counsellor is a person who gives advice or counsel, especially on personal problems (a marriage counsellor), whereas a councillor is a member of a city, county, or other council (she stood as a Labour candidate for city councillor).