The style guide I use, THE CHICAGO MANUAL OF STYLE, uses the term "prose" for all non-dialogue or quoted material. The word "narrative" is rarely used. However, fiction web sites, as well as Stack Exchange, seems to prefer "narrative." So my question is: Is there a professional difference (I'm not really looking for a dictionary definition; I use Webster's)? And then some follow-ups: Are there regional differences? Does fiction v. nonfiction matter? What about poetry? Thanks!
Prose is a form of language that exhibits a grammatical structure and a natural flow of speech rather than a rhythmic structure (as in traditional poetry).
Narrative is more or less storytelling.
You might get at better answer if you provide som examples of how you intend to use the two words.