This is the 2077th most frequent Chinese word.
共和国
"Republic."
In this sentence, '共和国' is used as a formal noun within the country name '中华人民共和国', denoting the type of state structure, specifically a republic.
中华人民共和国是一个社会主义国家。
The People's Republic of China is a socialist country.
Here, '共和国' is utilized as a descriptive term to categorize France as a republic among nations.
法国是一个欧洲的共和国，拥有悠久的历史。
France is a European republic with a long history.
In this instance, '共和国' is employed as a general term to describe a type of governance system prevalent in modern states.