When describing the edges of a stream, there are a variety of words that can be used instead of "stream bank." For instance, you could use the term "river bed" or "streambed" to describe the bottom of the stream itself. When talking about the land surrounding the stream, you could use the terms "river bank," "river margin," or "river shore." Other potential synonyms include "stream edge," "stream margin," "streamside," and "waterside." No matter which term you use, however, it's important to be clear in your meaning and context, as each word carries its own connotations and nuances.