Yes, box is a Scrabble word!
...and is worth 12 points in Scrabble, and 13 points in Words with Friends
box
Verb
1. Put into a box
2. Hit with the fist
3. Engage in a boxing match
Noun
1. A (usually rectangular) container; may have a lid
2. Private area in a theater or grandstand where a small group can watch the performance
3. The quantity contained in a box
4. A predicament from which a skillful or graceful escape is impossible
5. A rectangular drawing
6. Evergreen shrubs or small trees
7. Any one of several designated areas on a ball field where the batter or catcher or coaches are positioned
8. The driver's seat on a coach
9. Separate partitioned area in a public place for a few people
10. A blow with the hand (usually on the ear)
What Scrabble words can I make with the letters in box?
2 Letter Words
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Words that can be created with an extra letter added to box:
Y:boxy