The word "sagger" is quite specific and might not have a lot of direct synonyms. However, some possible alternatives could be "firing mold," "clay crucible," or "kiln container." Additionally, depending on the specific context of the word, synonyms might include "pottery vessel," "ceramic dish," or "baking pan." In some cases, more general terms like "container" or "vessel" might be used instead. It's important to consider the intended meaning of the word "sagger" and choose an appropriate synonym that accurately conveys the same idea.