noun (n)

• a person who rules or commands(noun.person)

  Synonym:
  swayer
  

  source: wordnet30
• measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths(noun.artifact)

  Synonym:
  rule
  

  source: wordnet30
• One who rules; one who exercises sway or authority; a governor.(noun)

  source: webster1913