Yes, nonextant is a Scrabble word!
...and is worth 16 points in Scrabble, and 19 points in Words with Friends
nonextant
Adjective
1. No longer in existence; lost or especially having died out leaving no living representatives
2. No longer existing or inaccessible through loss or destruction
What Scrabble words can I make with the letters in nonextant?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words