This is the 349th most frequent Urdu word.
کراچی
Karachi: A major city and seaport in Pakistan, also its largest city.
In this sentence, 'کراچی' is used as the proper noun representing a specific city.
کراچی پاکستان کا سب سے بڑا شہر ہے۔
Karachi is the largest city in Pakistan.
Here, 'کراچی' is used to refer to a destination, emphasizing the act of visiting the city.
میں کراچی کی سیر کرنے جا رہا ہوں۔
I am going to visit Karachi.
In this instance, 'کراچی' forms a possessive noun phrase indicating an attribute of the city, i.e., its climate.