caste

(noun) social status or position conferred by a system based on class. Example: "Lose caste by doing work beneath one's station."

(noun) (Hinduism) a hereditary social class among Hindus; stratified according to ritual purity.

(noun) a social class separated from others by distinctions of hereditary rank or profession or wealth.

(noun) in some social insects (such as ants) a physically distinct individual or group of individuals specialized to perform certain functions in the colony.