Hydrologist
You call someone that studies metal a metallurgist.
Land with some water
A tooth in some water. :-)
Some people call them water waddles
A person from the movie "Hostel!" If the person studies interactions among people and societies, from a scientific point of view, you call them a "social scientist" or "sociologist".
Well, different people call them different things. Some people call them Aqua Jumps, and some people call them Blobs!
Some call it a beach. Some call it a coastal plain.
Coconut water or some call it coconut milk.
Yes, some people in the straight edge scene call vitamin water "straight edge water"
Some asteroids contain water ice within their composition, while others do not. The presence of water on an asteroid depends on its location, composition, and history. Mission observations and asteroid studies have detected water ice on some asteroids, suggesting that water is a potential resource in space exploration.
There is no special name for scientists who study religion. They are still scientists by profession and education. There are scientists who follow or even study religion. Some scientists such as astronomers, physicist and anthropologists manage to reconcile creationism with the big bang. A person making a choice. a scientist who studies religion call Religionalogist or Religiologist
water is "eau" in French. I'd want some water: je voudrais de l'eau