Lupanar is a term used to refer to a brothel or a place where sexual activities are conducted. However, there are several synonyms that can be used to describe such a place. These include bawdy house, house of ill repute, bordello, red-light district, and whorehouse. Each of these words carries a different connotation and may be used depending on the context. For example, the term "red-light district" implies an area of a city where prostitution is prevalent, whereas "bordello" is typically associated with a more luxurious and well-maintained establishment. Despite the differences in these terms, they all serve to describe a place where commercial sex takes place.