Granary refers to a storehouse where grains are kept, and it can also be used to refer to an area that has a large quantity of grain storage. Some synonyms for granary include silo, barn, warehouse, repository, store, and cache. Silo is a cylindrical tower used for storing grain typically made of concrete or steel. A barn is a large building on a farm used for storing crops, including grains. A warehouse is a large storage building often used for commercial purposes. Repository and store are used in a broader sense of storing supplies and materials, while cache is typically used to describe a hidden storage place.