Pastourelle, a French word that is derived from the word "pastoral," refers to a medieval poem genre that describes the flirtation between a shepherdess and a knight. This genre was popular in the 13th century and was later revived in the 19th century as a literary movement. In literary parlance, pastourelle can be considered as an ancient and archaic term. However, there are some words that could be used as synonyms for pastourelle, such as pastoral ballad, rustic romance, and bucolic verse. These synonyms describe the content and subject matter of the pastourelle, and their use can add variety and interest to your writing.