Answer:
Colonialism ⇒ the control of an overseas colony by a foreign power
Imperialism ⇒ a policy extending political, economic, or military rule over a foreign nation
Supranational ⇒ membership in a group or organization that goes beyond national boundaries
Step-by-step explanation:
Colonialism and imperialism are very similar and usually are used as synonyms, but their actual definition varies a little:
Colonialism refers to physically controlling another country while imperialism refers to political and/or economic control. For example, the Soviet Union had an imperialistic control (mostly economic) over eastern European countries, but it didn't rule over them directly. On the other hand, the British Empire controls and rules over its colonies (although it has shrunk, it still exists).