a person who has special knowledge or skill in a field.

a person who excels in musical technique or execution.

a person who has a cultivated appreciation of artistic excellence, as a connoisseur or collector of objects of art, antiques, etc.

Obsolete . a person who has special interest or knowledge in the arts and sciences; scientist; scholar.

Also, virtuosic

noun

amateur , greenhorn , rookie

noun

ace , adept , artist , artiste , authority , big league * , brain * , celebrity , champ , champion , crackerjack * , dillettante , egghead , genius , hotshot , hot stuff , intelligent , magician , musician , natural * , no slouch , old hand * , old pro , performer , pro * , prodigy , professional , pundit , sharp * , star , superstar , whiz * , wizard , connoisseur , dilettante , expert , master , savant , soloist , whiz