fancy woman vs hooker

fancy woman and hooker both are nouns.

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

As nouns, hooker is a hyponym of fancy woman; that is, hooker is a word with a more specific, narrower meaning than fancy woman:

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