types:
ace,
adept,
champion,
genius,
hotshot,
maven,
mavin,
sensation,
star,
superhero,
superstar,
virtuoso,
whiz,
whizz,
wiz,
wizard
someone who is dazzlingly skilled in any field
agronomist
an expert in soil management and field-crop production
analyst
someone who is skilled at analyzing data
analyst
an expert who studies financial data (on credit or securities or sales or financial patterns etc.) and recommends appropriate business actions
archer,
bowman
a person who is expert in the use of a bow and arrow
authority
an expert whose views are taken as definitive
black belt
a person who attained the rank of expert in the martial arts (judo or karate)
cabalist,
kabbalist
an expert who is highly skilled in obscure or difficult or esoteric matters
exegete
a person skilled in exegesis (especially of religious texts)
geographer
a scientist trained in the study of the earth's surface
lapidarist,
lapidary
an expert on precious stones and the art of cutting and engraving them
mnemonist
an expert in the use of mnemonics; someone able to perform unusual feats of memory
nerd
an intelligent but single-minded expert in a particular technical field or profession
past master
someone who has long and thorough experience in a given activity
shark
a person who is unusually skilled in certain ways
shooter,
shot
a person who shoots (usually with respect to their ability to shoot)
talent
a person who possesses unusual innate ability in some field or activity
technician
someone known for high skill in some intellectual or artistic technique
technocrat
an expert who is a member of a highly skilled elite group