The best replacement for acronyms is abbreviations.

The best alternatives to acronyms are rated as following:
★★★★★  abbreviations
★★  acrostics
★  initialism
★  initialisms
★  jargon
  initials
  mnemonics

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Speaking about acronyms, one probably shouldn't forget about apostrophe.

Other search terms related to acronyms and their ratings are:
★★★★★ apostrophe
★★★★ apostrophes
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