viscount vs adult male

viscount and adult male both are nouns.

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

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

Other hypernyms of viscount include man, peer.

viscount (noun)	adult male (noun)
a British peer who ranks below an earl and above a baron	an adult person who is male (as opposed to a woman)
(in various countries) a son or younger brother or a count