Yes, adder is a Scrabble word!
...and is worth 7 points in Scrabble, and 7 points in Words with Friends
adder
Noun
1. A person who adds numbers
2. A machine that adds numbers
3. Small terrestrial viper common in northern Eurasia
What Scrabble words can I make with the letters in adder?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words