| noun | a person with special knowledge or ability who performs skillfully |
| adjective | having or showing knowledge and skill and aptitude “adept in handicrafts” |
| adjective | of or relating to or requiring special knowledge to be understood “technical terminology” |
| adept | noun | someone who is dazzlingly skilled in any field |
| adeptness | noun | skillful performance or ability without difficulty |
| expertness | noun | skillfulness by virtue of possessing special knowledge |
| proficiency | noun | skillfulness in the command of fundamentals deriving from practice and familiarity |
| skillfulness | noun | the state of being cognitively skillful |
| expertise | noun | skillfulness by virtue of possessing special knowledge |