The word "caver" is often used to refer to someone who explores caves, caverns, and other underground formations. However, there are several synonyms that can be used to describe this activity and the people who engage in it. Some common synonyms for "caver" include spelunker, potholer, and speleologist. Each of these words has slightly different connotations and may be used in different contexts. For example, "spelunker" is often used to describe amateur cave explorers, while "speleologist" is a more formal term used to describe scientists who study caves and their ecosystems. Regardless of the word used, exploring caves can be a fascinating and exciting activity.