"Send river" is not a commonly used phrase and it is unclear what it means. If you are looking for synonyms for the word "send", it can mean to dispatch, transmit, forward, deliver, or convey. If you are looking for synonyms for the word "river", it can mean a stream, brook, creek, or tributary. When used together in a sentence such as "send river", it is difficult to determine the intended meaning without additional context. Therefore, it is important to ensure clarity and specificity when communicating to convey the intended message accurately.