Yes, arbs is a Scrabble word!
...and is worth 6 points in Scrabble, and 7 points in Words with Friends
arbs
Noun
1. Someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential)
What Scrabble words can I make with the letters in arbs?
4 Letter Words
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3 Letter Words
2 Letter Words