There are several synonyms for the word "street-walker" which is often used to describe a prostitute who solicits customers in public places. Other terms include "call girl," "escort," "sex worker," "hooker," and "prostitute." Some synonyms are less derogatory than others, but all of these terms generally refer to someone who engages in sexual activity in exchange for payment. It's important to note that the term "street-walker" carries a negative connotation and is not an appropriate or respectful way to refer to individuals who work in the sex industry or engage in sex work. It's important to use language that is accurate, respectful, and non-judgmental when discussing this topic.