How do you spell Wrack

Available Definitions:
1)  n. - A thin, flying cloud; a rack.
2)  v. t. - To rack; to torment.
3)  n. - Wreck; ruin; destruction.
4)  n. - Any marine vegetation cast up on the shore, especially plants of the genera Fucus, Laminaria, and Zostera, which are most abundant on northern shores.
5)  n. - Coarse seaweed of any kind.
6)  v. t. - To wreck.