Hexastich refers to a poem or verse that consists of six lines. This type of poetry is often used to convey a complete thought or story in a concise manner. Synonyms for hexastich include sestet, sextain, stanza, and sixer. These terms all describe the same basic form of poetry, but each has its own nuances and connotations. For example, sestet is often used in formal poetry, while sextain has a more casual feel. Whatever word you choose to describe your six-line poem, it's important to remember that each line should work together to create a cohesive whole.