Bulrush.
In Exodus 2:3; Isaiah 18:2, the papyrus is referred to, a reed of which anciently paper was made. It was of this that the ark was made in which the infant Moses was put, Exodus 2:3, and the smaller boats on the Nile. Isaiah 18:2. In Isaiah 58:5 it is a different word, and is used for any kind of 'rush.' Both words are also translated 'rushes.'