fornicatress vs adult female

fornicatress and adult female both are nouns.

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

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

Other hypernyms of fornicatress include adulterer, fornicator, woman.

fornicatress (noun)	adult female (noun)
a woman adulterer	an adult female person (as opposed to a man)