Yes, purism is a Scrabble word!
...and is worth 10 points in Scrabble, and 13 points in Words with Friends
purism
Noun
1. Scrupulous or exaggerated insistence on purity or correctness (especially in language)
What Scrabble words can I make with the letters in purism?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words