gallant vs beau

gallant and beau both are nouns.

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

As nouns, gallant and beau are synonyms defined as:

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

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

gallant (noun)	beau (noun)
a man who attends or escorts a woman	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

gallant (adjective)	beau (adjective)
unflinching in battle or action
being attentive to women like an ideal knight
having or displaying great dignity or nobility
lively and spirited