yellow man vs adult male

yellow man and adult male both are nouns.

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

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

Other hypernyms of yellow man include man, oriental person.

yellow man (noun)	adult male (noun)
offensive term for an Asian man	an adult person who is male (as opposed to a woman)