An Abbess

1. 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. [First attested around 1150 to 1350][2]
2. (archaic, British slang) A woman who runs a brothel; a woman employed by a prostitute to find clients.[3][4]

(female superior of a nunnery): mother superior

(woman who runs a brothel): bawd, Covent Garden abbess, lady abbess, madam