Yes, fiver is a Scrabble word!
...and is worth 11 points in Scrabble, and 12 points in Words with Friends
fiver
Adjective
1. Being one more than four
Noun
1. A United States bill worth 5 dollars
What Scrabble words can I make with the letters in fiver?
4 Letter Words
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3 Letter Words
2 Letter Words