Synonyms of aristocracy in English:

the nobility, the peerage, the gentry, the upper class, the ruling class, the privileged class, the elite, high society, the establishment, the patriciate, the haut monde, the beau monde

aristocrats, lords, ladies, peers, peers of the realm, nobles, noblemen, noblewomen, titled men, titled people, titled women, patricians

informal the upper crust, the jet set, the beautiful people, the crème de la crème, the top drawer, aristos

British informal nobs, toffs