The best replacement for melting point is boiling point.

The best alternatives to melting point are rated as following:
★★★★★  boiling point
★★★★★  freezing point
★★★  melting range
★★★  atomic number
★  glass transition temperature
★  pour point
★  tlc
★  softening point
★  atomic number graph
★  molecular weight
  purity
  flash point
  decomposition
  lattice energy
  pyrolysis
  salad bowl
  heat of fusion
  atomic radius

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Speaking about melting point, one probably shouldn't forget about intermolecular forces.

Other search terms related to melting point and their ratings are:
★★★★★ intermolecular forces
★★★ periodic trends
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melting point
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