A warehouse is a commercial building for storage of goods. Warehouses are used by manufacturers, importers, exporters, wholesalers, transport businesses, etc.
A data warehouse is the main repository of an organization's historical data, its corporate memory. It contains the raw material for management's decision. A data warehouse is a central repository for all or significant parts of the data that an enterprise's various business systems collect.
A knowledge warehouse is the component of an enterprise's knowledge management system, used to develop, store, organize, process, and disseminate knowledge.