The best replacement for percent error is percent difference.

The best alternatives to percent error are rated as following:
★★★★★  percent difference
★★★★★  absolute error
★★★  standard deviation
★★  percent yield
★  standard error
★  percent uncertainty
★  relative error
  percent deviation
  percentage error

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Speaking about percent error, one probably shouldn't forget about differentials.

Other search terms related to percent error and their ratings are:
★★★★★ differentials
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percent error
percent difference
absolute error