Yes, deist is a Scrabble word!
...and is worth 6 points in Scrabble, and 6 points in Words with Friends
deist
Adjective
1. Of or relating to deism
Noun
1. A person who believes that God created the universe and then abandoned it
What Scrabble words can I make with the letters in deist?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words