Yes, attack is a Scrabble word!

Verb

1. Launch an attack or assault on; begin hostilities or start warfare with

2. Attack in speech or writing

3. Take the initiative and go on the offensive

4. Attack someone physically or emotionally

5. Set to work upon; turn one's energies vigorously to a task

6. Begin to injure

Noun

1. (military) an offensive against an enemy (using weapons)

2. An offensive move in a sport or game

3. Intense adverse criticism

4. Ideas or actions intended to deal with a problem or situation

5. The act of attacking

6. A decisive manner of beginning a musical tone or phrase

7. A sudden occurrence of an uncontrollable condition

8. The onset of a corrosive or destructive process (as by a chemical agent)

9. Strong criticism