Mentor :  (noun)

1: a wise and trusted guide and advisor [syn: wise man] (verb)

1: serve as a teacher or trusted counselor; "The famous professor mentored him during his years in graduate school"; "She is a fine lecturer but she doesn't like mentoring"

Dutch uncle, Polonius, abecedarian, admonisher, adviser, authority, backseat driver, buttinsky, certified teacher, coach, confidant, consultant, counsel, counselor, docent, doctor, dominie, don, educationist, educator, elder, elder statesman, expert, fellow, forerunner, great soul, guide, guru, illuminate, instructor, intellect, intellectual, kibitzer, lover of wisdom, maestro, mahatma, man of intellect, man of wisdom, mandarin, master, mastermind, meddler, melamed, monitor, mullah, nestor, oracle, orienter, pandit, pathfinder, pedagogist, pedagogue, philosopher, preceptist, preceptor, preparationist, preparator, preparer, professor, pundit, rabbi, rishi, sage, sapient, savant, scholar, schoolkeeper, schoolmaster, schoolteacher, seer, starets, teacher, thinker, trailblazer, trainer, wise man, wise old man,