The best replacement for freezing point is melting point.

The best alternatives to freezing point are rated as following:
★★★★★  melting point
★★★  boiling point
★★  freezing point depression
★  salt concentration
★  salinity
★  pour point
★  cloud point
  molality
  alcohol content
  pressure water
  at melting point

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Speaking about freezing point, one probably shouldn't forget about molality.

Other search terms related to freezing point and their ratings are:
★★★★★ molality
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