strapper vs adult male

strapper and adult male both are nouns.

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

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

Other hypernyms of strapper include man.

strapper (noun)	adult male (noun)
a large and strong and heavyset man	an adult person who is male (as opposed to a woman)