Clubroom
noun
A club room is a clubroom!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
そのマンガなら、部室にそろってるよ。
As for that manga, we have the whole series in the clubroom.
なぜか部室に魚を口にくわえたネコがいるんです。
For some reason, there is a cat with a fish in its mouth in the clubroom.
部室に忘れ物をしちゃった。
I forgot something in the clubroom.