energy
en-er-gy
noun
The capacity to do work, or a source of power like electricity.
"We must find new sources of renewable energy."
noun
The physical or mental strength and enthusiasm to be active.
"She has a lot of energy for her age."
Thesaurus
Synonyms: push, get-up-and-go, vigour, vim, vigor, muscularity, vitality, zip, free energy, Energy Department, Department of Energy, DOE