"expert" in the noun sense
1. expert
a person with special knowledge or ability who performs skillfully
"expert" in the adjective sense
1. adept, expert, good, practiced, proficient, skillful, skilful
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"
2. technical, expert
of or relating to or requiring special knowledge to be understood
"technical terminology"
"a technical report"
"technical language"
Source: WordNet® (An amazing lexical database of English)
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