vestal vs adult female

vestal and adult female both are nouns.

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

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

Other hypernyms of vestal include woman.

vestal (noun)	adult female (noun)
a chaste woman	an adult female person (as opposed to a man)

vestal (adjective)	adult female (adjective)
of or relating to Vesta
in a state of sexual virginity