The best replacement for rate constant is rate.


The best alternatives to rate constant are rated as following:
★★★★★  rate
★★★★★  equilibrium constant
★★★  rate law
★  reaction rate
★  reaction order
  rate of reaction

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Speaking about rate constant, one probably shouldn't forget about activation energy.

Other search terms related to rate constant and their ratings are:

★★★★★ activation energy
★★★★ half life
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rate constant
rate
equilibrium constant