The capital of Western Samoa is Apia. However, there are several synonyms that can be used to describe the city. One such synonym is "Mulinu'u", which is the name of the ancient and historic village where the country's parliament buildings are located. Another synonym is "Leulumoega", which is the name of the district in which Apia is located. Additionally, "Upolu Island" can also be used as a synonym for Apia, as it is the largest island in Samoa and houses the capital city. These synonyms are useful when discussing the city in different contexts or from different perspectives.