father surrogate vs adult male

father surrogate and adult male both are nouns.

Word	Noun	Adjective	Verb	Adverb
father surrogate	Yes	No	No	No
adult male	Yes	No	No	No

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

Other hypernyms of father surrogate include man.

father surrogate (noun)	adult male (noun)
a man who takes over all the functions of the real father	an adult person who is male (as opposed to a woman)