We are cousins, once removed, because we are one generation apart. Removed is the term applied to second cousins, third, fourth, and so-on. The rule on removed cousins is that the numbers - second, third, fourth, etc. For instance, my newest granddaughter, Hanna, would be my cousin Bob's cousin twice removed. Don't confuse removed cousins with second or third cousins.
Removed cousins are quite another critter.
Here the number, second, third, fourth, etc., refers to the number of generations between them and the common ancestor. Thus, my cousin Bob's son Steven and my children are second cousins and Bob and my grandchildren are cousins twice removed. And this is just the easy stuff. Just imagine what happens when cousins marry. Their children were double cousins.