The word 'boom' can be used as a word for explosion that starts with a b.
blast
The star losses its fuel and in helium in the core starts to turn into iron atoms making it expand with an violent explosion
Some famous places that begin with the letter B are:BoholBataanBatangasBeijingBotswanaBangladeshBelgiumBora Bora
Kobe Bryant and Ben Gordon
Theres one that is for five letters, Milkshuck I cant tell it.
blast
bomb
A bombing?
bomb
blast
blast
Synonyms of 'Explosion' which begin with the letter 'B' include; blast, burst, blow up, blow out, bang and bark.
An explosion that starts with a B could be: Boom, Bang, Blast.
Bear starts with the letter B
Belgium is a country that starts with B.
The chicken that starts with B is bantam.
A bumper sticker is sticky. It starts with the letter b.