Yes, bang is a Scrabble word!

Adverb

1. Directly

Verb

1. Strike violently

2. To produce a sharp often metallic explosive or percussive sound

3. Close violently

4. Move noisily

5. Have sexual intercourse with

6. Leap, jerk, bang

Noun

1. A vigorous blow

2. A sudden very loud noise

3. A border of hair that is cut short and hangs across the forehead

4. The swift release of a store of affective force

5. A conspicuous success