bulwarks
bul-warks
noun
The part of a ship's side above the upper deck, providing protection.
"The crew sheltered behind the ship's bulwarks from the waves."
noun
Strong defensive walls or structures providing protection against attack or danger.
"The city's ancient bulwarks stood firm against invaders."
Thesaurus
Synonyms: mole, breakwater, groyne, groin, jetty, seawall, wall, rampart