sir vs adult male

sir and adult male both are nouns.

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

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

Other hypernyms of sir include man.

sir (noun)	adult male (noun)
term of address for a man	an adult person who is male (as opposed to a woman)