The best replacement for hydroxide is magnesium oxide.

The best alternatives to hydroxide are rated as following:
★★★★★  magnesium oxide
★★★★  lye
★★★★  potassium hydroxide
★★★★  sodium hydroxide
★★★★  hydroxyl
★★★  magnesium citrate
★★  hydronium
★★  hydrogen
★  sodium carbonate
★  calcium hydroxide
★  caustic soda
★  methoxide
★  hydroxyl radical
★  sodium bicarbonate
★  oxide
★  ammonia
★  sodium hypochlorite
  hydrated lime
  calcium chloride
  magnesium hydroxide
  calcium oxide
  copper sulfate
  sodium
  aluminum oxide
  carbonate
  magnesium
  guanidine carbonate

Your alternative for hydroxide is not listed? Suggest!
Speaking about hydroxide, one probably shouldn't forget about carbon dioxide.

Other search terms related to hydroxide and their ratings are:
★★★★★ carbon dioxide
★★★★★ acid
★★★ sulfuric acid
★★★ magnesium hydroxide
★★ fluorine
★★ acetic acid
★ hydrochloric acid
★ phosphoric acid
★ sodium hydroxide
★ khp
★ potassium hydrogen phthalate
★ nitric acid
sulphuric acid
silver nitrate
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Google Trends

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hydroxide
magnesium oxide
lye