Yes, cameo is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
cameo
Noun
1. Engraving or carving in low relief on a stone (as in a brooch or ring)
What Scrabble words can I make with the letters in cameo?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words