Department, Station, Office
The kanji and the word are exactly the same. That means they share meanings as well.
The kanji and the vocab are exactly the same, even the reading. This one uses the on'yomi probably because it's often attached to other words (specifying a bureau, for example), so that's why it follows jukugo conventions despite being all alone.
I often see the news on this station.
You can mail out letters overseas at the post office.
The North American Bureau mainly does diplomacy with the United States and Canada.