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 plateWordNet sense 2 (a man who is the lover of a girl or young woman):
boyfriend, fellow, swain, young manFrom the ODE community, based on WordNetadd/edit