Yes, therein is a Scrabble word!
...and is worth 10 points in Scrabble, and 10 points in Words with Friends
therein
Adverb
1. (formal) in or into that thing or place
What Scrabble words can I make with the letters in therein?
7 Letter Words
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words