expert

nouns

a person with special knowledge or ability who performs skillfully
expert
is a type of (narrower)
a human being
"there was too much for one person to do"
individual, mortal, person, somebody, someone, soul

adjectives

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"
adept, expert, good, practiced, proficient, skilful, skillful
is derived from
expertness
of or relating to or requiring special knowledge to be understood
"technical terminology"; "a technical report"; "technical language"
expert, technical
is derived from
expertise