The best replacement for dialogue is dialog.

The best alternatives to dialogue are rated as following:
★★★★★  dialog
★★★★  discussion
★★★  debate
★★★  conversation
★★  monologue
★★  dialect
★  narrative
★  narration
  prose
  exposition
  direct quotation
  duologue
  prologue
  discourse
  dissemination
  negotiated procedure
  exact words of a conversation
  monologue debate
  talk

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

Other search terms related to dialogue and their ratings are:
★★★★★ quotations
★★★★★ quotation marks
You have in mind a companion for dialogue and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of dialogue in all years. Click on graph for more.
dialogue
dialog
discussion