street girl vs hooker

street girl and hooker both are nouns.

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

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

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

Other synonyms of street girl include floozie, floozy, hustler, slattern, streetwalker.

street girl (noun)	hooker (noun)
a prostitute who attracts customers by walking the streets	a prostitute who attracts customers by walking the streets
	(rugby) the player in the middle of the front row of the scrum who tries to capture the ball with the foot
	a golfer whose shots typically curve left (for right-handed golfers)