The phrase "piece tail" refers to a portion of a larger tail, typically used in fashion or textiles. However, there are a variety of synonyms for this term, depending on the context. For example, "tail end" could be used to describe the end portion of a tail, while "tailpiece" could refer to an attachment or accessory added to the end of a tail. "Tail flap" is another possible synonym, often used to describe the rear section of a horse's tail. Other options might include "tail section," "tail fragment," or simply "tail piece." Ultimately, the best synonym will depend on the specific context and intended meaning of the term.