This is the 7857th most frequent German word.
helgoland
Helgoland: A small German archipelago in the North Sea.
Here, 'Helgoland' is used as a proper noun to refer to the actual island.
Helgoland ist eine schöne Insel in der Nordsee.
Helgoland is a beautiful island in the North Sea.
In this sentence, 'Helgoland' continues as a proper noun, functioning as the destination to which the trip is planned.
Wir planten einen Ausflug nach Helgoland für das nächste Wochenende.
We planned a trip to Helgoland for the next weekend.
Now, 'Helgoland' is part of the adjective 'Helgoländer,' describing something originating from or related to Helgoland.