A megaproject is an undertaking that involves large amounts of money, resources, and planning to complete successfully. Synonyms for megaproject include mammoth project, colossal project, giant project, enormous undertaking, and huge venture. These synonyms highlight the sheer magnitude of a megaproject, which often involves massive infrastructure construction, such as railways, highways, airports, and dams. Other synonyms that capture the essence of a megaproject include massive development, major initiative, significant undertaking, and ambitious enterprise. Regardless of the synonym used, megaprojects require careful planning, financing, and execution to achieve successful outcomes. Without them, the project can have severe consequences on the environment and society at large.