There are a number of synonyms for the word "overstore," each with slightly different connotations and nuances. Some possible options might include "overstock," "surplus," "excess," "overflow," or "redundant." Each of these words can be used to describe a situation where there is more of something than is strictly necessary or desirable, whether that be goods in a store, people in a room, or ideas in a conversation. Depending on the context, different synonyms may be more or less appropriate, so it is important to consider the nuances of each option before choosing the right word for your needs.