Tetrastich is a form of poetry consisting of four lines, each having a syllable count of four. It is a lesser-known literary form, but can be a challenging and rewarding one to write. For those looking to explore different ways of expressing themselves through this form, there are a few synonyms they could consider. These include "quatrain," "four-liner," "quadverse," and "fourfold." Each of these words carries a slightly different connotation, so writers may want to experiment with them to see which word conveys the intended meaning best. Regardless of the word used, tetrastich remains a unique and interesting form of poetry to explore and master.