Yes, bust is a Scrabble word!

Verb

1. Ruin completely

2. Search without warning, make a sudden surprise attack on

3. Separate or cause to separate abruptly

4. Go to pieces

5. Break open or apart suddenly and forcefully

Adjective

1. Lacking funds

Noun

1. A complete failure

2. The chest of a woman

3. A sculpture of the head and shoulders of a person

4. An occasion for excessive eating or drinking