Yes, rifts is a Scrabble word!
...and is worth 8 points in Scrabble, and 8 points in Words with Friends
rifts
Noun
1. A gap between cloud masses
2. A narrow fissure in rock
3. A personal or social separation (as between opposing factions)
What Scrabble words can I make with the letters in rifts?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words