The best replacement for acronym is abbreviation.

The best alternatives to acronym are rated as following:
★★★★★  abbreviation
★★★★  initialism
★★★  mnemonic
★★  anagram
★★  acrostic
★  abbr
★  initialization
★  initialisation
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  acronym
  synonym
  alphabetism
  mnemonic device
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  eponym
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  backronym
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  pneumonic
  initial ism

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

Other search terms related to acronym and their ratings are:
★★★★★ apostrophe
an acronym
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