boy vs broth of a boy

boy and broth of a boy both are nouns.

Word	Noun	Adjective	Verb	Adverb
boy	Yes	No	No	No
broth of a boy	Yes	No	No	No

As nouns, broth of a boy is a hyponym of boy; that is, broth of a boy is a word with a more specific, narrower meaning than boy:

boy: a friendly informal reference to a grown man
broth of a boy: an outstanding person; as if produced by boiling down a savory broth

Other hyponyms of boy include broth of a man, one of the boys.

boy (noun)	broth of a boy (noun)
a youthful male person	an outstanding person; as if produced by boiling down a savory broth
(ethnic slur) offensive and disparaging term for Black man
a friendly informal reference to a grown man
a male human offspring