Overcarry is a word with somewhat limited use, generally referring to carrying something excessively or beyond what is necessary or practical. However, there are a variety of synonyms that can be used to convey this meaning, depending on the context in which the word is being used. Some options might include terms like overload, burden, encumber, overstress, or strain. These words all suggest that something has been carried or assumed to an excessive degree, and can be used to describe physical or emotional burdens, as well as more abstract concepts like responsibility or obligation. Overall, while overcarry may not be the most commonly used word, there are plenty of synonyms that can convey its meaning effectively.