beau vs swain

beau and swain both are nouns.

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

As nouns, beau and swain are synonyms defined as:

Other synonyms of beau include boyfriend, fellow.

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