supreme authority,
arbiter someone chosen to judge and decide a disputed issue; "the critic was considered to be an arbiter of modern literature"; "the arbitrator's authority derived from the consent of the disputants"; "an umpire was appointed to settle the tax case"
bowman,
archer a person who is expert in the use of a bow and arrow
authority official permission or approval; "authority for the program was renewed several times"
black belt a black sash worn to show expert standards in the martial arts (judo or karate)
An expert is someone widely recognized as a reliable source of technique or skill whose faculty for judging or deciding rightly, justly, or wisely is accorded authority and status by their peers or the public in a specific well-distinguished domain. An expert, more generally, is a person with extensive knowledge or ability based on research, experience, or occupation and in a particular area of study. Experts are called in for advice on their respective subject, but they do not always agree on the particulars of a field of study.
OmegaWiki Dictionary
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Expert Showing knowledge and skill and aptitude in performing some activity.
Expert A very knowledgeable person in a particular area or subject.
