chorus girl vs adult female

chorus girl and adult female both are nouns.

Word	Noun	Adjective	Verb	Adverb
chorus girl	Yes	No	No	No
adult female	Yes	No	No	No

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

Other hypernyms of chorus girl include dancer, professional dancer, terpsichorean, woman.

chorus girl (noun)	adult female (noun)
a woman who dances in a chorus line	an adult female person (as opposed to a man)