This is the 1989th most frequent Japanese word.
イギリス
"イギリス" means "United Kingdom" in English.
In this sentence, "イギリス" serves as the subject of the sentence, referring to the United Kingdom as a geographical and political entity.
イギリスはヨーロッパの島国です。
The United Kingdom is an island nation in Europe.
Here, "イギリス" is used to indicate possession, meaning 'of the United Kingdom' in the context of specifying its capital.
イギリスの首都はロンドンです。
The capital of the United Kingdom is London.
In this example, "イギリス" is the location where the action took place, denoting that the subject studied abroad specifically in the UK.