This is the 9454th most frequent Polish word.
washington
In Polish, "Washington" refers to the city of Washington, D.C., the capital of the United States.
In this sentence, "Washington" functions as a proper noun referring to an individual, possibly a person named Washington.
Washington odwiedzał Polskę w przeszłości.
Washington visited Poland in the past.
Here, "Waszyngton" (Polish for Washington) is used as a proper noun referring to the city
W stolicy Stanów Zjednoczonych, Waszyngtonie, odbyła się ważna konferencja.
In the capital of the United States, Washington, an important conference took place.
In this case, "Waszyngtońskie" is an adjectival form derived from the proper noun "Washington," indicating something originating from or pertaining to Washington.