Decemvirates are groups of ten individuals. However, there are plenty of synonyms for this word that may be useful in various contexts. One alternative would be a decennary, which also refers to a group of ten. Another synonym would be a decade, which denotes a period of ten years. Decade is commonly used to describe anniversaries or milestones. While decemvirates are usually associated with government or leadership, the word decury could be used to describe any group of ten individuals working together. Additionally, tentet refers to a group of ten musicians or performers, while decuple refers to increasing something by a factor of ten. Overall, there are many options available when looking for a synonym for decemvirates.