This is the 8636th most frequent Japanese word.
敦賀
"敦賀" (Tsuruga) is a city in Fukui Prefecture, Japan.
In this context, '敦賀' refers to a city name in Japan, indicating a proper noun usage.
敦賀は福井県の都市です。
Tsuruga is a city in Fukui Prefecture.
Here, '敦賀' is again used as a location name indicating the destination of the drive.
週末に敦賀までドライブしました。
We drove to Tsuruga over the weekend.
In this sentence, '敦賀' modifies '港' to specify the port's name, showing descriptive proper noun usage.