stunner vs adult female

stunner and adult female both are nouns.

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

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

Other hypernyms of stunner include woman.

stunner (noun)	adult female (noun)
an unexpected and amazing event	an adult female person (as opposed to a man)
a very attractive or seductive looking woman