buster vs adult male

buster and adult male both are nouns.

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

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

Other hypernyms of buster include man.

buster (noun)	adult male (noun)
a person (or thing) that breaks up or overpowers something	an adult person who is male (as opposed to a woman)
a person who breaks horses
a robust child
an informal form of address for a man
a person born in the generation following the baby boom when the birth rate fell dramatically