Yes, backs is a Scrabble word!

Verb

1. Be behind; approve of

2. Travel backward

3. Give support or one's approval to

4. Cause to travel backward

5. Support financial backing for

6. Be in back of

7. Place a bet on

8. Shift to a counterclockwise direction

9. Establish as valid or genuine

10. Strengthen by providing with a back or backing

Noun

1. The posterior part of a human (or animal) body from the neck to the end of the spine

2. The side that goes last or is not normally seen

3. The part of something that is furthest from the normal viewer

4. (football) a person who plays in the backfield

5. The series of vertebrae forming the axis of the skeleton and protecting the spinal cord

6. The protective covering on the front, back, and spine of a book

7. The part of a garment that covers the back of your body

8. A support that you can lean against while sitting

9. (American football) the position of a player on a football team who is stationed behind the line of scrimmage