Octad is a word that refers to a group of eight. However, there are many other synonyms that can be used to describe a group of eight people or things. These synonyms include octet, octuplet, eight-pack, eight-piece, eightfold, and eightfold. Each word has a slightly different connotation depending on the context in which it is used. For example, octet is often used to describe a musical group with eight members, while octuplet is typically used to describe a group of eight siblings born at the same time. Regardless of which synonym is used, they all indicate a group of eight and can be used interchangeably in many situations.