Potamophobia - Is the fear of running water. There isn't one specifically for waterfalls.
Potamophobia
There are no waterfalls on the river Thames.
A step like series of waterfalls are called a cataract
A Botanist is a person who studies plants but also studies waterfalls.
precipitatiopn
Rapids
Dk
Fall Line
They are called Zoras you will learn about then in the future storyline.
waterfalls
waterfalls
That HM is called Waterfall.