noun (n)

• someone who administers a business(noun.person)

  Synonym:
  decision maker
  

  source: wordnet30
• the party appointed by a probate court to distribute the estate of someone who dies without a will or without naming an executor(noun.person)

  source: wordnet30
• someone who manages a government agency or department(noun.person)

  Synonym:
  executive
  

  source: wordnet30
• One who administers affairs; one who directs, manages, executes, or dispenses, whether in civil, judicial, political, or ecclesiastical affairs; a manager.(noun)

  source: webster1913