expert

[1]	authority , professional , specialist , scholar , master , connoisseur , pundit , (Colloq) wizard , whiz , pro , ace , (Brit) dab hand , boffin , (Slang) (US) maven/mavin

adj.

[1]

skilful , adept , good , skilled , trained , practiced , proficient , knowledgeable , learned , skillful , skilful , experienced , practised , qualified , adept , proficient , accomplished , au fait , adroit , dexterous , polished , finished , masterful , masterly , first-rate , excellent , superb , wonderful , superior , champion(ship) , A-one , A-1 , virtuoso , (Colloq) top-notch , (Brit) whizzo , wizard , (US) crackerjack , crack

[2]

technical