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Synonyms for Beau (same or very similar meaning)

WordNet sense 1 (a man who is much concerned with his dress and appearance):
clotheshorse, dandy, dude, fop, gallant, sheik, swell, fashion plate

WordNet sense 2 (a man who is the lover of a girl or young woman):
boyfriend, fellow, swain, young man

From the ODE community, based on WordNetadd/edit