Yes, purist is a Scrabble word!
...and is worth 8 points in Scrabble, and 10 points in Words with Friends
purist
Noun
1. Someone who insists on great precision and correctness (especially in the use of words)
What Scrabble words can I make with the letters in purist?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words