Yes, demos is a Scrabble word!
...and is worth 8 points in Scrabble, and 9 points in Words with Friends
demos
Verb
1. Give an exhibition of to an interested audience
Noun
1. A visual presentation showing how something works
What Scrabble words can I make with the letters in demos?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words