The best replacement for possessives is plurals.

The best alternatives to possessives are rated as following:
★★★★★  plurals
★★★★  contractions
  plurals worksheet

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Speaking about possessives, one probably shouldn't forget about gerunds.

Other search terms related to possessives and their ratings are:
★★★★★ gerunds
★★ apostrophes
You have in mind a companion for possessives and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of possessives in all years. Click on graph for more.
possessives
plurals
contractions