There are many synonyms for the term "letter writer." Some include correspondent, epistolarian, pen pal, scribe, and missive maker. Each term has its own unique connotations and context in which it may be appropriate to use. For example, a correspondent may suggest a formal exchange of letters, while a pen pal may suggest a more casual and personal correspondence. Likewise, a scribe may be used in a historical or religious context. It is important to consider the context and audience when choosing which synonym to use for the term "letter writer".