The best replacement for synopsis is summary.

The best alternatives to synopsis are rated as following:
★★★★★  summary
★★★  abstract
★★★  treatment
★★  executive summary
★★  plot
★  outline
★  query
★  blurb
★  plot summary
★  logline
★  synopsis
★  synopses
  premise
  cadence
  query letter

Your alternative for synopsis is not listed? Suggest!
Speaking about synopsis, one probably shouldn't forget about project report.

Other search terms related to synopsis and their ratings are:
★★★★★ project report
★★★★ query letter
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synopsis
summary
abstract