Wordnet 3.0
NOUN (2)
1. 
 a young woman who is employed; 
2. 
 a woman who engages in sexual intercourse for money; 
[syn: prostitute, cocotte, whore, harlot, bawd, tart, cyprian, fancy woman, working girl, sporting lady, lady of pleasure, woman of the street]
WordNet (r) 3.0 (2006):
working girl
    n 1: a young woman who is employed
    2: a woman who engages in sexual intercourse for money [syn:
       prostitute, cocotte, whore, harlot, bawd, tart,
       cyprian, fancy woman, working girl, sporting lady,
       lady of pleasure, woman of the street]