Yes, closed is a Scrabble word!

Adjective

1. Not open or affording passage or access

2. (set theory) of an interval that contains both its endpoints

3. Not open

4. Used especially of mouth or eyes

5. Requiring union membership

6. With shutters closed

7. Not open to the general public

8. Not having an open mind

9. Blocked against entry

Verb

1. Move so that an opening or passage is obstructed; make shut

2. Become closed

3. Cease to operate or cause to cease operating

4. Finish or terminate (meetings, speeches, etc.)

5. Come to a close

6. Complete a business deal, negotiation, or an agreement

7. Be priced or listed when trading stops

8. Engage at close quarters

9. Cause a window or an application to disappear on a computer desktop

10. Change one's body stance so that the forward shoulder and foot are closer to the intended point of impact

11. Come together, as if in an embrace

12. Draw near

13. Bring together all the elements or parts of

14. Bar access to

15. Fill or stop up

16. Unite or bring into contact or bring together the edges of

17. Finish a game in baseball by protecting a lead