minx vs adult female

minx and adult female both are nouns.

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

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

Other hypernyms of minx include woman.

minx (noun)	adult female (noun)
a seductive woman who uses her sex appeal to exploit men	an adult female person (as opposed to a man)