Yes, burst is a Scrabble word!

Verb

1. Come open suddenly and violently, as if from internal pressure

2. Force out or release suddenly and often violently something pent up

3. Burst outward, usually with noise

4. Move suddenly, energetically, or violently

5. Be in a state of movement or action

6. Emerge suddenly

7. Cause to burst

8. Break open or apart suddenly and forcefully

Noun

1. The act of exploding or bursting

2. Rapid simultaneous discharge of firearms

3. A sudden flurry of activity (often for no obvious reason)

4. A sudden intense happening