The word "hexad" refers to a group or series of six items. However, there are several other words that can be used as synonyms for the word "hexad". These include sextet, hexagon, half-dozen, six-pack, sixfold, and sestet. A sextet is a group of six musicians or singers who perform together, while a hexagon is a six-sided polygon. A half-dozen simply means six of something, and a six-pack usually refers to a set of six canned or bottled beverages. Sixfold is used to describe something that is six times as much or as many, and a sestet is a six-line stanza or poem. These synonyms can add variety and precision when discussing groups of six.