The term "heptagonal" is commonly used as a synonym for "seven-sided." "Heptagon" refers to a polygon with seven sides. Other synonyms for "seven-sided" include "septangular," "septilateral," and "heptahedral." These terms are often used in mathematical and geometric contexts to describe shapes or figures that have seven sides. In other contexts, the term "septenate" may be used to refer to a group of seven things or individuals. Synonyms for "seven-sided" can be helpful when trying to convey specific details or characteristics about an object or shape, and they can be used to add variety and precision to speech or writing.