streetwalker vs street girl

streetwalker and street girl both are nouns.

Word	Noun	Adjective	Verb	Adverb
streetwalker	Yes	No	No	No
street girl	Yes	No	No	No

As nouns, streetwalker and street girl are synonyms defined as:

streetwalker and street girl: a prostitute who attracts customers by walking the streets

Other synonyms of streetwalker include floozie, floozy, hooker, hustler, slattern.

streetwalker (noun)	street girl (noun)
a prostitute who attracts customers by walking the streets	a prostitute who attracts customers by walking the streets