The best replacement for activation energy is free energy.

The best alternatives to activation energy are rated as following:

★★★★★	free energy
★★★	rate of reaction
★★★	activation barrier
★★	reaction rate
★	gibbs free energy
★	transition state
	bond energy
	heat of reaction
	ignition temperature
	enzymes

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

Other search terms related to activation energy and their ratings are:

★★★★★	rate constant
★★	arrhenius equation

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activation energy

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rate of reaction