You'll see this attached to other words... like "sales" or "tennis." When you see this, you'll know it is a ___ department, or a ___ club, making this word mean department or club, similar to the kanji meaning.
The reading is the on'yomi reading. Don't type the 〜 out when writing the answer. It's just there to let you know that there's usually something attached to this word.
human resources department
Could you call the head of the editorial department ASAP?
I belonged to a kendo club back in junior high school.
I’m the head of the accounting department.