Yes, close is a Scrabble word!

Adverb

1. Near in time or place or relationship

2. In an attentive manner

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

Adjective

1. At or within a short distance in space or time or having elements near each other

2. Close in relevance or relationship

3. Not far distant in time or space or degree or circumstances

4. Rigorously attentive; strict and thorough

5. Marked by fidelity to an original

6. (of a contest or contestants) evenly matched

7. Crowded

8. Lacking fresh air

9. Of textiles

10. Strictly confined or guarded

11. Confined to specific persons

12. Fitting closely but comfortably

13. Used of hair or haircuts

14. Giving or spending with reluctance

15. Inclined to secrecy or reticence about divulging information

Noun

1. The temporal end; the concluding time

2. The last section of a communication

3. The concluding part of any performance