Bomb
noun
An explode bullet is when an explode shoots out of something like a bullet, but much bigger, like from a bomb.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
爆弾を分解することは危険だってことは分かってたんだけど、すごく興味があったんだ。
I knew taking apart the bomb could be very dangerous, but I was really interested.