backwoodsman vs adult male

backwoodsman and adult male both are nouns.

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

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

Other hypernyms of backwoodsman include man, pioneer.

backwoodsman (noun)	adult male (noun)
a man who lives on the frontier	an adult person who is male (as opposed to a woman)