The word "exilian" is quite rare and can be difficult to find synonyms for. However, there are a few options that may be suitable for certain contexts. One possibility is "banished," which implies a forced removal from a specific place or group. Another synonym could be "expelled," which suggests that the person was removed due to some sort of infraction or problematic behavior. Finally, "exiled" is a more common synonym that indicates a person has been sent away from their home or country. While these words may not be a perfect match for "exilian," they can convey similar ideas of being removed or isolated.