communist nation
Refers to a country governed under communist principles. Often used in political or historical contexts.
The Soviet Union was once a powerful communist nation.
共産主義 is the ideology of communism, while 共産国家 is a nation that practices it.
Communist bloc
Compound of 共産 (communist) and 国家 (nation). The exact historical derivation is uncertain, but the term follows standard Sino-Japanese word formation.