working girl vs prostitute

working girl and prostitute both are nouns.

Word	Noun	Adjective	Verb	Adverb
working girl	Yes	No	No	No
prostitute	Yes	No	Yes	No

As nouns, working girl and prostitute are synonyms defined as:

working girl and prostitute: a woman who engages in sexual intercourse for money

working girl (noun)	prostitute (noun)
a young woman who is employed	a woman who engages in sexual intercourse for money
a woman who engages in sexual intercourse for money

working girl (verb)	prostitute (verb)
	sell one's body; exchange sex for money