hooker vs fancy woman

hooker and fancy woman both are nouns.

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

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

hooker (noun)	fancy woman (noun)
a prostitute who attracts customers by walking the streets	an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man
(rugby) the player in the middle of the front row of the scrum who tries to capture the ball with the foot	a woman who engages in sexual intercourse for money
a golfer whose shots typically curve left (for right-handed golfers)