Septemviral is a rare word that refers to a group of seven people having equal power or authority. Though it may not be a commonly used term, there are several synonyms that can be used to convey a similar meaning. These words include heptad, septad, sevenfold, and seven-man. All these words indicate a baseline of seven and emphasize the presence of a group working together with equal capabilities and authority. These synonyms are often used in historical contexts, particularly in politics and governance, and can convey a sense of equality and balance among the members of the group.