The best replacement for bitter melon is bitter gourd.

The best alternatives to bitter melon are rated as following:
★★★★★  bitter gourd
★★★  ampalaya
★★  karela
★  chinese bitter melon
  gourd
  gymnema sylvestre

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Speaking about bitter melon, one probably shouldn't forget about salted egg.

Other search terms related to bitter melon and their ratings are:
★★★★★ salted egg
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bitter melon
bitter gourd
ampalaya