expert
consultant – Professional who provides advice in their specific field of expertise
Polymath – Individual whose knowledge spans a substantial number of subjects
General
Scholar – Person who pursues academic and intellectual activities
Know-how – Practical knowledge on how to accomplish something
Skill – The ability to carry out a task
Competence – Ability of a person to do a job properly
Excellence – Talent or quality which surpasses ordinary standards
Technocracy – Government by scientists, engineers and other experts
Criticism
anti-intellectualism – Hostility to and mistrust of education, philosophy, art, literature, and science
denialism – A person's choice to deny reality, as a way to avoid a psychologically uncomfortable truth
Psychology