The best replacement for synonym is antonym.

The best alternatives to synonym are rated as following:
★★★★★  antonym
★★  homonym
★  view
★  subjective synonym
★  alias
  pseudonym
  private synonym
  antonym definition
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  wonderful
  public synonym
  acronym

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Speaking about synonym, one probably shouldn't forget about doubt.

Other search terms related to synonym and their ratings are:
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synonym
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