Yes, keep is a Scrabble word!

Verb

1. Keep in a certain state, position, or activity; e.g., "keep clean"

2. Continue a certain state, condition, or activity

3. Retain possession of

4. Stop (someone or something) from doing something or being in a certain state

5. Conform one's action or practice to

6. Stick to correctly or closely

7. Look after; be the keeper of; have charge of

8. Maintain by writing regular records

9. Supply with room and board

10. Allow to remain in a place or position or maintain a property or feature

11. Supply with necessities and support

12. Fail to spoil or rot

13. Behave as expected during of holidays or rites

14. Keep under control; keep in check

15. Maintain in safety from injury, harm, or danger

16. Raise

17. Retain rights to

18. Store or keep customarily

19. Have as a supply

20. Maintain for use and service

21. Hold and prevent from leaving

22. Prevent (food) from rotting

Noun

1. The financial means whereby one lives

2. The main tower within the walls of a medieval castle or fortress

3. A cell in a jail or prison