Speleology, also known as cave exploration or cave science, involves the study and exploration of caves and other underground spaces. If you're looking for synonyms for speleology, you could consider terms such as spelunking, caving, potholing, or cave diving. Each of these terms refers to a different aspect of speleology - spelunking generally involves visiting and exploring caves, while caving may involve more technical exploration and mapping. Potholing is similar to caving but often involves shorter journeys and more confined spaces, while cave diving involves the use of scuba equipment to explore underwater caves and tunnels.