This is the 416th most frequent Japanese word.
本部
Headquarters.
In this sentence, '本部' is used to mean 'headquarters' or the main office of a company or organization.
その会社の本部は東京にあります。
The headquarters of that company is located in Tokyo.
Here, '本部' refers to the main office or center of operations for the fire department.
消防本部が緊急事態に対応しています。
The fire department headquarters is responding to the emergency.
In this case, '本部' is used to mean the central location or command center where organizational activities are coordinated.