Scotchman vs adult male

Scotchman and adult male both are nouns.

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

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

Other hypernyms of Scotchman include Scot, man.

Scotchman (noun)	adult male (noun)
a male native or inhabitant of Scotland	an adult person who is male (as opposed to a woman)