Aristocracy: The highest class in certain societies, especially those holding hereditary titles or offices. Like C-suite executives in a corporation.
Feudal Contract: A set of mutual obligations between a lord and his vassal, usually involving granting of fiefs in return for military service. It's like an employment contract outlining duties and compensation.
Serfs: Agricultural laborers bound under feudalism to work on their lord's estate. They're akin to low-level workers or laborers in modern times.