abbess
noun
°A female superior or governess of a nunnery, or convent of nuns, having the same authority over the nuns which the abbots have over the monks.
"The abbess was always after the nuns to keep the convent immaculately clean."
°A bawd, the mistress of a brothel (1811 Dictionary of the Vulgar Tongue).
synonyms: mother superior, lady abbess