loose man vs adult male

loose man and adult male both are nouns.

Word	Noun	Adjective	Verb	Adverb
loose man	Yes	No	No	No
adult male	Yes	No	No	No

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

Other hypernyms of loose man include adulterer, fornicator, man.

loose man (noun)	adult male (noun)
a male adulterer	an adult person who is male (as opposed to a woman)