WordNet (r) 3.0 (2006):

loose woman
    n 1: a woman adulterer [syn: adulteress, fornicatress,
         hussy, jade, loose woman, slut, strumpet,
         trollop]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "loose woman":
   Jezebel, bad woman, baggage, bitch, broad, chippy, clitoromaniac,
   cocotte, drab, easy lay, easy woman, floozy, frail sister,
   grisette, harridan, hussy, hysteromaniac, jade, nymphet, nympho,
   nymphomaniac, pickup, quean, slut, strumpet, tart, trollop, trull,
   uteromaniac, wanton, wench, whore