wall, inguen, mole, jetty, mol, gram molecule, barrier, groyne, dock, embankment, harbor, sea wall, rampart, groin, bulwark, counterspy, seawall.
When she looked back, she saw the top of the man's head moving behind the breakwater,
in a parallel direction to her own course.
I wouldn't try to build a breakwater!
At breakfast next morning- four o'clock- we were off Delaware Breakwater,
and that afternoon at two we began the mast- head watch for fish.