A synonym for "source of information" could be "data repository," "knowledge base," "reference point," "information hub," or "resource center." Each of these terms conveys the idea of a place or entity from which information can be obtained. Depending on the context, other terms like "archive," "database," "library," or "wellspring" might also be appropriate. The choice of synonym often depends on the specific type of information being referred to and the context in which it is used. For example, "archive" might be more suitable for historical data, while "database" could be more appropriate for structured, digital information.