Whirlpool

A whirlpool is water that normally goes along deciding to go around instead, usually without warning.
Splash

A splash is what water does when something enters it without asking. It then lands on you.
Bath

A bath is a bowl of water you sit in until you are clean or it is cold, whichever comes first.
Pothole
The most common form of pothole repair in the developed world is a white circle painted around it.
Quicksand

A person cannot sink completely into quicksand; it is too dense, and they would float at about the waist.
Petrichor

The smell of rain on dry ground has a name, petrichor, and our noses can detect it in tiny traces.
Hail

Hailstones grow in layers like onions, and the biggest ever measured in the US was 20 cm across.
Waterfall

Water at the top of a waterfall has no idea what is coming; water at the bottom has opinions.
Stepping stone

Every set of stepping stones contains exactly one wobbly stone, and it is never the one you tested.
Bubble

A bubble is a small amount of air wearing a very thin coat of water, and it has never once survived being admired.