Noun:
1: expert a person with special knowledge or ability who performs skillfully
Adjective:
1: adept, skilful, expert, skillful, skilled, proficient, practiced, good having or showing knowledge and skill and aptitude; "adept in handicrafts"; "an adept juggler"; "an expert job"; "a good mechanic"; "a practiced marksman"; "a proficient engineer"; "a lesser-known but no less skillful composer"; "the effect was achieved by skillful retouching"