What is another word for activation energy?
Pronunciation: [ˌaktɪvˈe͡ɪʃən ˈɛnəd͡ʒi] (IPA) 
Activation energy is the amount of energy that needs to be inputted into a chemical system before a reaction can occur. In chemistry, there are various synonyms for activation energy, including energy barrier, potential energy barrier, and threshold energy. The term threshold energy is often used in biological systems to refer to the minimum energy required to initiate a biochemical reaction. Similarly, potential energy barrier is used to refer to the energy difference between the reactants and the highest energy point on the reaction path. Overall, these synonyms can be used interchangeably, but their usage may depend on the particular context of the chemical system being studied.
