This is the 7375th most frequent Spanish word.
helsinki
"Helsinki" is not a Spanish word; it refers to the capital city of Finland.
Here, 'Helsinki' is used as a proper noun referring to a specific place: the capital city of Finland.
Helsinki es la capital de Finlandia.
Helsinki is the capital of Finland.
In this sentence, 'Helsinki' functions as a geographical proper noun indicating the destination of the trip.
Visitaremos Helsinki durante nuestras vacaciones.
We will visit Helsinki during our vacation.
Here, 'Helsinki' identifies the city being described in terms of its architectural qualities, functioning as the subject of the admiration expressed.