white slave vs fancy woman

white slave and fancy woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
white slave	Yes	No	No	No
fancy woman	Yes	No	No	No

As nouns, fancy woman is a hypernym of white slave; that is, fancy woman is a word with a broader meaning than white slave:

white slave (noun)	fancy woman (noun)
a woman sold into prostitution	an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man
	a woman who engages in sexual intercourse for money