A reliable, definitive source of information on a subject.
Persons, regarded collectively, who occupy official positions of power; police or law enforcement.
Official permission; authorisation to act in some capacity on behalf of a ruling entity.
A government-owned agency that runs a revenue-generating activity for public benefit.
Status as a trustworthy source of information, reputation for mastery or expertise; or claim to such status or reputation.
Power or right to make or enforce rules or give orders; or a position having such power or right.
Someone who is an expert in, or devoted to, some specific branch of study or research.
A stenotopic species.
A physician whose practice is limited to a particular branch of medicine or surgery.
Any of several non-commissioned ranks corresponding to that of corporal.
An organism that is specialized for a particular environment.
Specialised, involving detailed knowledge of a restricted topic.