Yes, sises is a Scrabble word!
...and is worth 5 points in Scrabble, and 5 points in Words with Friends
sises
Noun
1. The cardinal number that is the sum of five and one
2. A female person who has the same parents as another person
What Scrabble words can I make with the letters in sises?
4 Letter Words
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3 Letter Words
2 Letter Words