The best replacement for appositives is appositive phrases.

The best alternatives to appositives are rated as following:
★★★★★  appositive phrases

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Speaking about appositives, one probably shouldn't forget about commas.

Other search terms related to appositives and their ratings are:
★★★★★ commas
★★★★ colons
★★★★ dashes
★★ no commas
★★ pronouns
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appositives
appositive phrases