all-rounder [British], Renaissance man

ace, adept, artist, authority, cognoscente, connoisseur, crackerjack (also crackajack), dab [chiefly British], dab hand [chiefly British], expert, fiend, geek, guru, hand, hotshot, maestro, master, maven (also mavin), meister, past master, proficient, scholar, shark, sharp, virtuoso, whiz, wizard

pro, professional

consultant, hired gun, specialist

addict, aficionado (also afficionado), buff, devotee, enthusiast, fan

craftsman, journeyman

apprentice, beginner, neophyte, novice

dabbler, dilettante

layman, nonprofessional

amateur, inexpert, nonexpert

all-rounder [British], Renaissance man

ace, adept, artist, authority, cognoscente, connoisseur, crackerjack (also crackajack), dab [chiefly British], dab hand [chiefly British], expert, fiend, geek, guru, hand, hotshot, maestro, master, maven (also mavin), meister, past master, proficient, scholar, shark, sharp, virtuoso, whiz, wizard

pro, professional

consultant, hired gun, specialist

addict, aficionado (also afficionado), buff, devotee, enthusiast, fan

craftsman, journeyman

apprentice, beginner, neophyte, novice

dabbler, dilettante

layman, nonprofessional

amateur, inexpert, nonexpert