beau vs macaroni

beau and macaroni both are nouns.

Word	Noun	Adjective	Verb	Adverb
beau	Yes	No	No	No
macaroni	Yes	No	No	No

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

beau: a man who is much concerned with his dress and appearance
macaroni: a British dandy in the 18th century who affected Continental mannerisms

Other hyponyms of beau include cockscomb, coxcomb.

beau (noun)	macaroni (noun)
a man who is the lover of a man or woman	pasta in the form of slender tubes
a man who is much concerned with his dress and appearance	a British dandy in the 18th century who affected Continental mannerisms