spokesman vs adult male

spokesman and adult male both are nouns.

Word	Noun	Adjective	Verb	Adverb
spokesman	Yes	No	No	No
adult male	Yes	No	No	No

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

Other hypernyms of spokesman include man, interpreter, representative, spokesperson, voice.

spokesman (noun)	adult male (noun)
a male spokesperson	an adult person who is male (as opposed to a woman)