Yes, fixity is a Scrabble word!
...and is worth 19 points in Scrabble, and 18 points in Words with Friends
fixity
Noun
1. The quality of being fixed in place as by some firm attachment
2. The quality of being incapable of mutation
What Scrabble words can I make with the letters in fixity?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words