bas bleu vs adult female

bas bleu and adult female both are nouns.

Word	Noun	Adjective	Verb	Adverb
bas bleu	Yes	No	No	No
adult female	Yes	No	No	No

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

Other hypernyms of bas bleu include woman.

bas bleu (noun)	adult female (noun)
a woman having literary or intellectual interests	an adult female person (as opposed to a man)