Yes, theines is a Scrabble word!
...and is worth 10 points in Scrabble, and 10 points in Words with Friends
Theines is a valid Scrabble word.
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What Scrabble words can I make with the letters in theines?
Words that can be created with an extra letter added to theines:
There are 3 words that can be made by adding another letter to 'theines'.