dandy vs beau

dandy and beau both are nouns.

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

As nouns, dandy and beau are synonyms defined as:

dandy and beau: a man who is much concerned with his dress and appearance

Other synonyms of dandy include clotheshorse, dude, fashion plate, fop, gallant, sheik, swell.

dandy (noun)	beau (noun)
a sailing vessel with two masts; a small mizzen is aft of the rudderpost	a man who is the lover of a man or woman
a man who is much concerned with his dress and appearance	a man who is much concerned with his dress and appearance

dandy (adjective)	beau (adjective)
excellent