Yes, sequin is a Scrabble word!
...and is worth 15 points in Scrabble, and 17 points in Words with Friends
sequin
Noun
1. Adornment consisting of a small piece of shiny material used to decorate clothing
What Scrabble words can I make with the letters in sequin?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words