demimonde n 1: a class of woman not considered respectable because of indiscreet or promiscuous behavior
Demimonde \Dem`i*monde"\, n. [F.; demi + monde world, L. mundus.] Persons of doubtful reputation; esp., women who are kept as mistresses, though not public prostitutes; demireps. [1913 Webster] {Literary demimonde}, writers of the lowest kind. [1913 Webster]
22 Moby Thesaurus words for "demimonde": Aspasia, Delilah, Jezebel, Messalina, Phryne, Thais, adventuress, courtesan, demimondaine, demirep, fancy woman, femme fatale, harem girl, hetaera, houri, kept, odalisque, seductress, temptress, vamp, vampire, whore