Yes, doubt is a Scrabble word!
...and is worth 8 points in Scrabble, and 10 points in Words with Friends
doubt
Verb
1. Consider unlikely or have doubts about
2. Lack confidence in or have doubts about
Noun
1. The state of being unsure of something
2. Uncertainty about the truth or factuality or existence of something
What Scrabble words can I make with the letters in doubt?
4 Letter Words
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3 Letter Words
2 Letter Words