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In sports, the term official is used to describe a person enforcing playing rules in the capacity of a linesman, referee and umpire; also specified by the discipline, e.g. American football official, Ice hockey official.
The term officer is close to being a synonym (but has more military connotations). A functionary is someone who carries out a particular role within an organization; this again is quite a close synonym for official, as a noun, but with connotations closer to bureaucrat. Any such person acts in their official capacity, in carrying out the duties of their office; they are also said to officiate, for example in a ceremony. A public official is an official of central or local government.
Read more about this topic: Government Officials