Is theirs a Scrabble word?
Yes, theirs is a Scrabble word!
...and is worth 9 points in Scrabble, and 8 points in Words with Friends
Theirs is a valid Scrabble word.
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What Scrabble words can I make with the letters in theirs?
Words that can be created with an extra letter added to theirs:
There are 16 words that can be made by adding another letter to 'theirs'.