outdoorsman vs adult male

outdoorsman and adult male both are nouns.

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

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

outdoorsman: a male person who spends time outdoors (e.g., hunting or fishing)
adult male: an adult person who is male (as opposed to a woman)

Other hypernyms of outdoorsman include man, outdoorsperson.

outdoorsman (noun)	adult male (noun)
a male person who spends time outdoors (e.g., hunting or fishing)	an adult person who is male (as opposed to a woman)