Saints refer to women who become the living representatives of the Virgin Mary through holy calling. Their main duties are to serve the church, including preaching, praying and teaching. As the representative of the Virgin, the status of a saint is higher than that of an ordinary nun, and she is usually appointed by a bishop or priest and given corresponding rights and responsibilities.
Nuns are female members of Catholicism who are responsible for performing religious ceremonies and taking care of the daily life of believers. Their main job is to assist priests in mass, prayer, vigil and other activities. The duties of nuns are relatively simple, and their status is lower than that of saints.
Therefore, although both saints and nuns have contributed to Catholicism, there are differences in their responsibilities, status and practice methods.