A pen pal is someone with whom one exchanges letters on a regular basis. If you're looking for other ways to describe this kind of correspondence, some synonyms include "correspondent," "writing friend," "letter buddy," "mailing mate," and "epistolary companion". You could also use words like "palliative partner", "note mate", or "scribe soul mate." Whether you're searching for a more sophisticated term, such as "confidant," or a more casual expression, like "ink mate," there are plenty of ways to refer to a pen pal. Regardless of the name you choose, the most important part of a pen pal relationship is the connection and shared exchange of information and ideas.