Herr vs adult male

Herr and adult male both are nouns.

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

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

Herr: a German man; used before the name as a title equivalent to Mr in English
adult male: an adult person who is male (as opposed to a woman)

Other hypernyms of Herr include man.

Herr (noun)	adult male (noun)
a German courtesy title or form of address for a man	an adult person who is male (as opposed to a woman)
a German man; used before the name as a title equivalent to Mr in English