Yes, crack is a Scrabble word!

Verb

1. Become fractured; break or crack on the surface only

2. Make a very sharp explosive sound

3. Make a sharp sound

4. Hit forcefully; deal a hard blow, making a cracking noise

5. Pass through (a barrier)

6. Break partially but keep its integrity

7. Break suddenly and abruptly, as under tension

8. Gain unauthorized access computers with malicious intentions

9. Suffer a nervous breakdown

10. Tell spontaneously

11. Cause to become cracked

12. Reduce (petroleum) to a simpler compound by cracking

13. Break into simpler molecules by means of heat

Adjective

1. Of the highest quality

Noun

1. A long narrow opening

2. A narrow opening

3. A long narrow depression in a surface

4. A sudden sharp noise

5. A chance to do something

6. Witty remark

7. A blemish resulting from a break without complete separation of the parts

8. A purified and potent form of cocaine that is smoked rather than snorted; highly addictive

9. A usually brief attempt

10. The act of cracking something