signor vs adult male

signor and adult male both are nouns.

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

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

signor: used as an Italian courtesy title; can be prefixed to the name or used separately
adult male: an adult person who is male (as opposed to a woman)

Other hypernyms of signor include man.

signor (noun)	adult male (noun)
used as an Italian courtesy title; can be prefixed to the name or used separately	an adult person who is male (as opposed to a woman)