This is the 4128th most frequent Japanese word.
モンゴル
Mongolia.
Here, "モンゴル" refers to the country, Mongolia, as a proper noun to indicate a geographical and cultural entity.
モンゴルは広大な草原で有名です。
Mongolia is famous for its vast grasslands.
In this sentence, "モンゴル" is used to signify the country of origin of an individual, formally expressing nationality.
彼はモンゴルから来た留学生です。
He is an exchange student from Mongolia.
Here, "モンゴル" is used adjectivally to describe cuisine originating from Mongolia, indicating a cultural aspect.