debutante vs adult female

debutante and adult female both are nouns.

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

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

Other hypernyms of debutante include woman.

debutante (noun)	adult female (noun)
a young woman making her debut into society	an adult female person (as opposed to a man)