white slave vs tart

white slave and tart both are nouns.

Word	Noun	Adjective	Verb	Adverb
white slave	Yes	No	No	No
tart	Yes	Yes	No	No

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

white slave (noun)	tart (noun)
a woman sold into prostitution	a small open pie with a fruit filling
	a pastry cup with a filling of fruit or custard and no top crust
	a woman who engages in sexual intercourse for money

white slave (adjective)	tart (adjective)
	tasting sour like a lemon
	harsh