The best replacement for dialect is accent.

The best alternatives to dialect are rated as following:
★★★★★  accent
★★★★  language
★★★★  slang
★★  dialogue
★★  vernacular
★  register
★  variety
★  standard english
★  creole
★  daylyt
  standard language
  jargon
  southern dialect
  idiolect
  rhetoric
  northern dialect
  non standard dialect
  sensa
  standaardtaal
  regional language

Your alternative for dialect is not listed? Suggest!
Speaking about dialect, one probably shouldn't forget about lisp.

Other search terms related to dialect and their ratings are:
★★★★★ lisp
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dialect
accent
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