beau vs gallant

beau and gallant both are nouns.

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

As nouns, beau and gallant are synonyms defined as:

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

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

beau (noun)	gallant (noun)
a man who is the lover of a man or woman	a man who attends or escorts a woman
a man who is much concerned with his dress and appearance	a man who is much concerned with his dress and appearance

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