The best replacement for full stop is period.

The best alternatives to full stop are rated as following:
★★★★★  period
★★  question mark
★★  full stop
★  semicolon
★  bracket first
★  speech marks first
★  dot
  exclamation mark
  rolling stop

Your alternative for full stop is not listed? Suggest!
Speaking about full stop, one probably shouldn't forget about inverted commas.

Other search terms related to full stop and their ratings are:
★★★★★ inverted commas
★★★ abbreviations
You have in mind a companion for full stop and it is not yet here? Propose!



Google Trends

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full stop
period
question mark