Yes, barks is a Scrabble word!

Verb

1. Speak in an unfriendly tone

2. Cover with bark

3. Remove the bark of a tree

4. Make barking sounds

5. Tan (a skin) with bark tannins

Noun

1. Tough protective covering of the woody stems and roots of trees and other woody plants

2. A noise resembling the bark of a dog

3. A sailing ship with 3 (or more) masts

4. The sound made by a dog