This is the 8496th most frequent Korean word.
成都
"成都" is a Chinese word, not Korean, meaning "Chengdu," a city in China.
In this sentence, '成都' refers to the proper noun Chengdu, which is a place name.
成都는 중국의 유명한 도시입니다.
Chengdu is a famous city in China.
Here, '成都' is again used as a proper noun representing the city Chengdu.
내 친구는 成都에 가서 유명한 요리를 맛보았습니다.
My friend went to Chengdu and tasted famous cuisine.
In this context, '成都' is used to describe attributes or characteristics of the city Chengdu, indicating its cultural aspects.