Yes, alias is a Scrabble word!
...and is worth 5 points in Scrabble, and 6 points in Words with Friends
alias
Adverb
1. As known or named at another time or place
Noun
1. A name that has been assumed temporarily
What Scrabble words can I make with the letters in alias?
4 Letter Words
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3 Letter Words
2 Letter Words