Yes, orcas is a Scrabble word!
...and is worth 7 points in Scrabble, and 8 points in Words with Friends
orcas
Noun
1. Predatory black-and-white toothed whale with large dorsal fin; common in cold seas
What Scrabble words can I make with the letters in orcas?
4 Letter Words
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3 Letter Words
2 Letter Words