Yes, sixths is a Scrabble word!
...and is worth 16 points in Scrabble, and 15 points in Words with Friends
sixths
Noun
1. Position six in a countable series of things
2. One part in six equal parts
3. The musical interval between one note and another six notes away from it
What Scrabble words can I make with the letters in sixths?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words