feudal state
A historical term referring to a state organized under feudalism, where power is held by feudal lords.
Many feudal states existed in medieval Europe.
封建制度 refers to the feudal system itself, while 封建国家 refers to the state or country organized under that system.
Compound of 封建 (feudal) and 国家 (state). The term is a modern coinage used in historical and political contexts.