Yes, sierras is a Scrabble word!
...and is worth 7 points in Scrabble, and 7 points in Words with Friends
sierras
Noun
1. A range of mountains (usually with jagged peaks and irregular outline)
2. A Spanish mackerel of western North America
What Scrabble words can I make with the letters in sierras?
7 Letter Words
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words