gold digger vs adult female

gold digger and adult female both are nouns.

Word	Noun	Adjective	Verb	Adverb
gold digger	Yes	No	No	No
adult female	Yes	No	No	No

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

gold digger: a woman who associates with or marries a rich man in order to get valuables from him through gifts or a divorce settlement
adult female: an adult female person (as opposed to a man)

Other hypernyms of gold digger include woman.

gold digger (noun)	adult female (noun)
a miner who digs or pans for gold in a gold field	an adult female person (as opposed to a man)
a woman who associates with or marries a rich man in order to get valuables from him through gifts or a divorce settlement