Megasporange is a term used to describe a large, specialized structure found in plants that contains megaspores. Megaspores are female reproductive cells that develop into female gametophytes, which in turn produce eggs for fertilization. While there are not many synonyms for the term megasporangium, one might refer to it as a megasporophyll, or simply as the megasporangium or megasporocyte. Another term that might be used to describe the megasporangium is the nucellus, which is the innermost layer of the ovule that contains the megasporocyte. Overall, while there may not be many synonyms for megasporangium, each term can provide a better understanding of the role this specialized structure plays in plant reproduction.