The word scriven is not commonly used in modern language, and therefore, there are not many synonyms for it. However, depending on the context in which the word is used, there are some alternative expressions that one could utilize instead. For example, if scriven is being used to describe the act of writing or composing, more common synonyms could be scribble, draft, pen, or compose. If the term is being applied to someone who is a writer or author, words like writer, scribe, author, or wordsmith would be more apt. Finally, if scriven is being used in the context of legal or official documents, terms such as legal scribe, clerk, or record-keeper would be more relevant.