Answer:
Empire, Kingdom, Nation, Emirate.
Step-by-step explanation:
All of the above fit that definition, I suggest you pick the one that you remember was in your lessons. Otherwise there isn't much I can do with a definition that basic. However, I can give you a basic background behind each that may help you remember which one fits your lessons. An Empire generally consists of many differing kingdoms(Roman Empire, British Empire, etc.) A kingdom consists of many differing Duchies (similar to a state). A Nation is a more modern version of a kingdom. An Emirate is an Islamic/middle eastern kingdom.