Synonyms for Consultant:

n.

elder, back seat driver, career coach, Dutch Uncle, careline, council. anesthesiologist, coroner, anaesthetist, counsel, cardiologist, chiropractor, clinician, dermatologist, counselor, analyst, mentor, anesthetist, opinion. adviser (noun)
counselor.
consultant (noun)
advisor, adviser.
expert (noun)
sophisticate, master, authority, journeyman, specialist, maven, expert, technician, wizard, pro, professional, artist, buff, connoisseur, adept, whiz, genius, crackerjack.
professional advisor (noun)
expert, counsel, advisor, maven, specialist, pro, authority, master, mentor.
sage (noun)
mandarin, wise person, scholar, philosopher, intellectual, thinker, savant, guru, sage, doctor, professor.

Other synonyms:

anaesthetist, dermatologist, chiropractor, Dutch Uncle, cardiologist, careline, back seat driver, anesthesiologist, coroner, career coach, anesthetist, clinician. counselor, council, mentor, elder. counsel. Other relevant words:
dermatologist, coroner, anaesthetist, clinician, elder, council, cardiologist, mentor, careline, counsel, counselor, advisor, analyst, anesthesiologist, adviser, opinion, chiropractor, anesthetist.