Under-crofts refer to the basement of a building, typically used for storage. Synonyms of under-crofts include basement, cellar, subterranean level, lower level, lower ground floor, storage area, and vault. These terms can be used interchangeably, depending on the context and the type of building being referred to. Under-crofts are often utilized in medieval architecture and can be found in castles, cathedrals, or other historical structures. They can also be commonly found in modern buildings such as restaurants, shops, and museums. Regardless of the specific term used, under-crofts remain an essential feature of any building that requires additional storage space or an extra level of functionality.