bluestocking vs adult female

bluestocking and adult female both are nouns.

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

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

Other hypernyms of bluestocking include woman.

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