Your first cousin's daughter is your first cousin once removed. Her grandadaughter is your first cousin twice removed.
Your second cousin's daughter is your second cousin once removed. Her grandadaughter is your second cousin twice removed.
And so forth.
It gets more complicated if you start with a cousin once removed , or twice removed, etc., two possibilities for many such relationships.
There is no real relationship, however, in most families they are considered 'cousins.'
None
Second cousins
Cousins
Your cousin's daughter is your first cousin once removed. Your daughter and your cousin's daughter would be second cousins.
They would be cousins.
Your relationship would be that of cousins.
Your nephew and your daughter are first cousins.
You are First Cousins
You are cousins
Your great uncle's kids are your parent's first cousins. His grandchildren are your second cousins.
Your daughter and your niece are first cousins Your daughter and your great grand niece are first cousins, twice removed.
Your child and your sister's daughter are first cousins. Your grand child and your sister's daughter are first cousins, once removed.
Your daughter and your niece are first cousins to each other.