| ditch |
| mole(noun, defense, refuge) |
| quay(noun, refuge, dock, port, wharf) |
| boom |
| breastwork(guard, fortification, wall, bulwark, rampart) |
| defense(noun, support, cover, guard, resistance) |
| dock(noun, port, wharf) |
| fence(noun, cover, position, block, bar) |
| fortification(noun, support, cover, position, block) |
| haven(noun, refuge, dock, port, wharf) |
| port(noun, refuge, dock, wharf) |
| roadstead(noun, refuge, dock, port, wharf) |
| sea wall(noun, expression, idiom, wall) |
| shore(noun, edge, land, side, bank) |
| anthill(pile, stack) |
| bank slope(expression, idiom) |
| barricade(noun, cover, position, block, bar) |
| battlement(defense, fortification, wall) |
| beach(noun, edge, land, side, soil) |
| buttress(noun, support, cover, position, guard) |