Abovestairs is an old-fashioned word that refers to the upper floor or floors of a building. There are several synonyms for abovestairs, including upstairs, upper level, upper story, top floor, top level, and attic. These words are often used interchangeably depending on the context of the sentence. While upstairs and upper level can refer to any floor above the ground floor, upper story and top floor specifically refer to the highest floor of a building. Attic is a synonym for abovestairs that refers specifically to a room or space directly beneath the roof of a house or building.