wonder boy vs adult male

wonder boy and adult male both are nouns.

Word	Noun	Adjective	Verb	Adverb
wonder boy	Yes	No	No	No
adult male	Yes	No	No	No

As nouns, adult male is a hypernym of wonder boy; that is, adult male is a word with a broader meaning than wonder boy:

Other hypernyms of wonder boy include man.

wonder boy (noun)	adult male (noun)
a man who is unusually successful at an early age	an adult person who is male (as opposed to a woman)