Spelunking is the art of exploring caves, and the word "spelunk" is used to describe this activity. Other synonyms for spelunk include caving, potholing, and speleology. These terms are often used interchangeably, and all refer to the act of exploring underground caverns, tunnels, and other geological formations. Other related words include underground exploration, subterranean exploration, and cave diving. All of these words share a common theme, which is the exploration of the earth's surface and its hidden secrets. Whether you are an experienced spelunker or just starting out, these synonyms are all great ways to describe your love of adventure and exploration.