Expert, proficient (12)
I believe the answer is:
accomplished
I believe this is a double definition.
'expert' is the first definition.
(synonyms)
'proficient' is the second definition.
(synonyms)
(Other definitions for accomplished that I've seen before include "Having particular skills" , "Performed - completed - with a high degree of skill" , "Professional" , "Completed; skilful" , "Highly proficient" .)