What does the nun counterfeit or pretend she has in The Canterbury Tales?

In Geoffrey Chaucer's "The Canterbury Tales," the nun, also known as the Prioress, counterfeits or pretends to have aristocratic manners and sophistication. She tries to emulate the behavior and refinement of the nobility, speaking in a refined manner and displaying elegant table manners. However, her attempts at sophistication are seen as artificial and exaggerated, highlighting the theme of social satire in the work.