the.com/waterpower

means The energy harnessed from moving or falling water, used to drive machinery or generate electricity.

from A straightforward compound of 'water' and 'power,' it entered English use as mills and wheels began turning streams into mechanical work — the word doing exactly what it says, no disguise needed. 'Power' itself traces back through Old French 'pouair' to Latin 'posse,' meaning 'to be able.' The compound became especially common with the rise of watermills and, later, hydroelectric dams, each era simply adding new machinery behind the same old word.