The best replacement for sodium hydroxide is potassium hydroxide.

The best alternatives to sodium hydroxide are rated as following:
★★★★★  potassium hydroxide
★★★  sodium bicarbonate
★★★  sodium carbonate
★★★  calcium hydroxide
★★  lye
★★  sodium chloride
★  sodium methoxide
★  hydrochloric acid
★  ammonium hydroxide
★  caustic soda
★  sodium hypochlorite
  magnesium hydroxide
  guanidine hydroxide
  naoh
  ammonia
  sulfuric acid

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Speaking about sodium hydroxide, one probably shouldn't forget about hydrochloric acid.

Other search terms related to sodium hydroxide and their ratings are:
★★★★★ hydrochloric acid
★★★★★ sulfuric acid
★★★ aluminum
★★★ ammonium chloride
★★ acetic acid
★★ carbon dioxide
★★ silver nitrate
★★ nitric acid
★★ lead ii nitrate
★ iron iii nitrate
★ oxalic acid
★ benzoic acid
★ phosphoric acid
★ phenol
★ copper nitrate
★ potassium hydrogen phthalate
khp
ammonia
copper sulfate
phenolphthalein
iron iii chloride
barium nitrate
acetone
methanol
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sodium hydroxide
potassium hydroxide
sodium bicarbonate