elite, elite group - a group or class of persons enjoying superior intellectual or social or economic status

noblesse - members of the nobility (especially of the French nobility)

baronage, peerage - the peers of a kingdom considered as a group

lords temporal, second estate - the second estate of the realm: the nobility (especially British nobility) of the rank of duke or marquess or earl or viscount or baron

knighthood - aristocrats holding the rank of knight

samurai - feudal Japanese military aristocracy

Ferdinand and Isabella - joint monarchs of Spain; Ferdinand V and Isabella I

William and Mary - joint monarchs of England; William III and Mary II

aristocrat, blue blood, patrician - a member of the aristocracy

upper class, upper crust - the class occupying the highest position in the social hierarchy

landed gentry, squirearchy - the gentry who own land (considered as a class)