The best replacement for deputy is sheriff.

The best alternatives to deputy are rated as following:
★★★★★  sheriff
★★★★  assistant
★★★  officer
★★  vice
★★  assistant head
★  sergeant
★  depute
★  lasting power of attorney
★  corporal
  dust right
  attorney
  deputy chief
  representative
  sargent
  lieutenant
  state trooper

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Speaking about deputy, one probably shouldn't forget about festool.

Other search terms related to deputy and their ratings are:
★★★★★ festool
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deputy
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