conductress vs adult female

conductress and adult female both are nouns.

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

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

Other hypernyms of conductress include conductor, woman.

conductress (noun)	adult female (noun)
a woman conductor	an adult female person (as opposed to a man)