Bullworks refer to defensive structures erected on a ship's deck to prevent water from entering during storms. Synonyms for this term include bulwarks, railings, guardrails, barriers, and partitions. The term bulwarks is commonly used on ships and boats to refer to a protective barrier along the sides of a vessel. Guardrails are an important synonym and refer to a protective barrier that runs along the vessel's sides or decks. Partitions are also used to describe sections of a ship that separate areas and help contain water during storms. Overall, these synonyms help describe the important safety features of a ship that provide protection and support during rough sea conditions.