Yes, rivals is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
rivals
Verb
1. Be equal to in quality or ability
2. Be the rival of, be in competition with
Noun
1. The contestant you hope to defeat
What Scrabble words can I make with the letters in rivals?
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Words that can be created with an extra letter added to rivals:
E:revisal