Yes, opals is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
opals
Noun
1. A translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones
What Scrabble words can I make with the letters in opals?
4 Letter Words
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3 Letter Words
2 Letter Words