How do you differentiate a waterfall from a waterfall?

The Iguazu Falls and the Niagara Falls are two of the most famous natural landscapes in America. But, exactly, why are they waterfalls and not waterfalls? What is the difference between the two terms? Basically, the difference lies in the size of the jump and in the flow of water. The waterfall is the smaller fall (although they can be huge compared to a human being), while a waterfall is a very large fall. Another difference is that cataracts u…