Yes, lockbox is a Scrabble word!
...and is worth 22 points in Scrabble, and 25 points in Words with Friends
lockbox
Noun
1. A fireproof metal strongbox (usually in a bank) for storing valuables
What Scrabble words can I make with the letters in lockbox?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words