committeeman vs adult male

committeeman and adult male both are nouns.

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

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

Other hypernyms of committeeman include committee member, man.

committeeman (noun)	adult male (noun)
a man who is a member of committee	an adult person who is male (as opposed to a woman)