Yes, firing is a Scrabble word!

Verb

1. Start firing a weapon

2. Cause to go off

3. Bake in a kiln so as to harden

4. Terminate the employment of; discharge from an office or position

5. Go off or discharge

6. Drive out or away by or as if by fire

7. Call forth (emotions, feelings, and responses)

8. Destroy by fire

9. Provide with fuel

Noun

1. The act of firing weapons or artillery at an enemy

2. The act of discharging a gun

3. The act of setting something on fire

4. The termination of someone's employment (leaving them free to depart)