eyeful vs adult female

eyeful and adult female both are nouns.

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

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

Other hypernyms of eyeful include woman.

eyeful (noun)	adult female (noun)
a full view; a good look	an adult female person (as opposed to a man)
a strikingly beautiful woman