The best replacement for gall is gaul.

The best alternatives to gall are rated as following:
★★★★★  gaul
★★★  myrrh
★★  mckeesport municipal water authority
★  bile
★  burl
  canker
  manjakani

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Speaking about gall, one probably shouldn't forget about vinegar.

Other search terms related to gall and their ratings are:
★★★★★ vinegar
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gall
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