bridegroom vs adult male

bridegroom and adult male both are nouns.

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

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

Other hypernyms of bridegroom include man, honeymooner, newlywed.

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

Other hypernyms of bridegroom include man, participant, player.

bridegroom (noun)	adult male (noun)
a man who has recently been married	an adult person who is male (as opposed to a woman)
a man participant in his own marriage ceremony