Yes, gismo is a Scrabble word!
...and is worth 8 points in Scrabble, and 10 points in Words with Friends
gismo
Noun
1. Something unspecified whose name is either forgotten or not known
2. A device or control that is very useful for a particular job
What Scrabble words can I make with the letters in gismo?
4 Letter Words
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3 Letter Words
2 Letter Words