adulteress vs adult female

adulteress and adult female both are nouns.

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

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

Other hypernyms of adulteress include adulterer, fornicator, woman.

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