This is the 1111th most frequent Japanese word.
館長
Director or chief of a building or facility (e.g., library, museum).
In this sentence, '館長' is used to refer to the director or head of a library.
図書館の館長と会話をしました。
I had a conversation with the director of the library.
Here, '館長' denotes the director or head of a museum.
博物館の新しい館長が素晴らしい展示を企画しました。
The new director of the museum planned a marvelous exhibition.
In this example, '館長' refers to the managing director of an art gallery.