The best replacement for administrator is executor.

The best alternatives to administrator are rated as following:
★★★★★  executor
★★★★  manager
★★★★  coordinator
★★  power user
★★  administrator
★★  director
★  administrative assistant
★  analyst
★  standard user
★  engineer
★  leader
★  executor of estate
★  developer
★  liquidator
★  network administrator
★  supervisor
★  system administrator
★  personal representative
  receiver
  database administrator
  moderator
  specialist
  domain admin
  user
  office manager
  domain administrator
  systems administrator
  admin assistant
  network engineer
  assistant
  isp
  super administrator joomla
  city manager
  administrators
  teacher
  administratrix
  custodian
  power user privileges
  trustee
  it manager
  super user
  programmer
  payroll specialist
  database developer

Your alternative for administrator is not listed? Suggest!
Speaking about administrator, one probably shouldn't forget about admin rights.

Other search terms related to administrator and their ratings are:
★★★★★ admin rights
★ uac
★ prompt
cmd
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Google Trends

Scale is based on the average worldwide traffic of administrator in all years. Click on graph for more.
administrator
executor
manager