Antistrophes are pairs of lines in a poem that alternate with another set of lines called the strophe. They are a common element in Greek lyrical poetry and are often used to create a sense of balance and harmony. Some synonyms for antistrophes include counterpoems, alternates, compliments, and responses. Antistrophes can also be described as the opposite or reverse of the strophe, with similar meaning or tone but a different perspective or angle. These poetic devices add depth and complexity to a poem, allowing the poet to explore multiple perspectives and themes in a single work.