Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
The hat that you put on is way too heavy for you. It falls off your head and hits the ground with a loud KABOOM (かぶ). You put it back on and pull it down tight, but this time it pulls you to the ground with an even louder KABOOM!
We should put hats on when we go out in summer.
The one with the Konan mask who is playing innocently is Koichi, and the other one next to him who is carefully watching over Koichi is Viet.
On a rainy day in Osaka, I saw a middle aged woman wearing a plastic bag on her head while riding a bicycle.