What is the synonym of attic?

Synonym of attic is garret, which is traditional literary term for habitable attic room at top of house, often with sloped ceilings. Another common synonym is loft, which is widely used in British English to mean attic space under roof, and also used in American English for converted attic or upper storage space. Other synonyms include storage attic, upper room, or in specific contexts, mansard when referring to attic under mansard roof, and belfry for tower attic. For finished attic living space, synonyms include bonus room, attic bedroom, or sky room. In general dictionary, primary synonyms for attic are garret and loft, both describing uppermost space under roof used for storage or living. So if you need one word synonym, garret is most precise and traditional, while loft is more modern and commonly understood, especially in British English where loft is standard term for attic.