prostitute vs adult female

prostitute and adult female both are nouns.

Word	Noun	Adjective	Verb	Adverb
prostitute	Yes	No	Yes	No
adult female	Yes	No	No	No

As nouns, adult female is a hypernym of prostitute; that is, adult female is a word with a broader meaning than prostitute:

Other hypernyms of prostitute include woman.

prostitute (noun)	adult female (noun)
a woman who engages in sexual intercourse for money	an adult female person (as opposed to a man)

prostitute (verb)	adult female (verb)
sell one's body; exchange sex for money