working girl vs fancy woman

working girl and fancy woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
working girl	Yes	No	No	No
fancy woman	Yes	No	No	No

As nouns, working girl and fancy woman are synonyms defined as:

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

working girl (noun)	fancy woman (noun)
a young woman who is employed	an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man
a woman who engages in sexual intercourse for money	a woman who engages in sexual intercourse for money