This is the 8751st most frequent German word.
kufstein
"Kufstein" is not a German word with a specific meaning but rather the name of a town in Tyrol, Austria.
Here, 'Kufstein' functions as a proper noun representing a town in Austria, serving as the object complement of the sentence.
Ich habe Kufstein im letzten Sommer besucht.
I visited Kufstein last summer.
In this sentence, 'Kufsteiner' is an adjective derived from 'Kufstein' and refers to something related to Kufstein, in this case, a song.
Das Kufsteiner Lied wird oft auf Volksfesten gespielt.
The Kufstein song is often played at folk festivals.
Here, 'Kufstein' is used as a family name, functioning as the subject of the sentence.