The word 'waterfall' is a transparent compound formed from two native English elements, 'water' and 'fall'. Its logic is purely descriptive, directly naming the natural phenomenon where water descends or falls from a height. Both components trace back to common Proto-Germanic roots, watōr and fallaną, which carried the same fundamental meanings. This straightforward compounding reflects a common pattern in English for creating concrete, descriptive terms for observable features of the natural world.

Structure: water (liquid) + fall (descend) water: From Old English wæter, of Proto-Germanic origin; related to Dutch water and German Wasser. The core element denoting the liquid. fall: From Old English feallan, of Proto-Germanic origin; related to Dutch vallen and German fallen. The element denoting the action of descending.