doxy vs fancy woman

doxy and fancy woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
doxy	Yes	No	No	No
fancy woman	Yes	No	No	No

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

doxy: a woman who cohabits with an important man
fancy woman: an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man

Other hypernyms of doxy include kept woman, mistress.

doxy (noun)	fancy woman (noun)
a woman who cohabits with an important man	an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man
	a woman who engages in sexual intercourse for money