Dry well is a term used to describe a geological formation that has run out of water. There are several synonyms for this phrase that can be used interchangeably depending on the context. Some of the common synonyms for dry well include empty well, barren well, dry hole, waterless well, and unproductive well. These words imply that the well is no longer producing water or has become completely dry. The use of synonyms can help add variety to a text or conversation, making it more interesting and engaging.