lulu vs adult female

lulu and adult female both are nouns.

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

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

Other hypernyms of lulu include woman.

lulu (noun)	adult female (noun)
a very attractive or seductive looking woman	an adult female person (as opposed to a man)