but isn't the problem that rain river sea tap etc are not attributes of water at all, but locations or names? the distinction being driveen by human experience and not properties of the molecule/s? how water is encountered?
The words are given by humans but the physical nature of say a river, it's speed, width, cleanliness and temperature are down to the environment.
It is useful that humans have given words to these forms of water.
River means there may be a supply of food (fish), as does
sea but while
river suggests we could drink it's water
sea indicates that we cannot, while
rain means we can collect it's clean water. Clearly then they
are different forms of water, with very different properties.
John W