Funambulation is a word that refers to the act of walking on a tightrope or a slackline, and it's not a term commonly used in everyday language. However, there are several synonyms that can be used to express the same idea, such as high-wire walking, slacklining, tightrope walking, wire-walking, and rope-walking. While these terms share the same basic meaning, they can be used in different contexts and to describe different levels of difficulty or risk. In any case, those who enjoy the thrill of balancing on a narrow surface high above the ground may find that any of these words will suit their needs just fine.