Seapost is a term used to describe a location where ships stop to take on supplies and mail. There are a number of synonyms that can be used to describe such a location, depending on the context and specific use. Some common alternatives to the word seapost include harbor, port, wharf, pier, dock, quay, and anchorage. Each of these words carries a slightly different connotation and may be preferred in different situations. For example, a harbor may be a larger and more developed seaport than a wharf, which may be a smaller or more informal location for ships to dock. Ultimately, the choice of synonym will depend on the intended message and tone of the writing.