The best replacement for intern is extern.

The best alternatives to intern are rated as following:
★★★★★  extern
★★★★  resident
★★★  employee
★★★  volunteer
★  internship
★  trainee
★  co op
★  in turn
★  apprentice
★  coop
★  co-op
  internee
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  intern
  fellow
  to_sym
  resident doctor
  engineer in training
  pharmacy technician
  ojt
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  medical resident
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  va nurse
  internist
  extern definition

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Speaking about intern, one probably shouldn't forget about steve irwin.

Other search terms related to intern and their ratings are:
★★★★★ steve irwin
★★ jesse james
★ jfk
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