Yes, thumbs is a Scrabble word!
...and is worth 13 points in Scrabble, and 15 points in Words with Friends
thumbs
Verb
1. Travel by getting free rides from motorists
2. Look through a book or other written material
3. Feel or handle with the fingers
Noun
1. The thick short innermost digit of the forelimb
2. The part of a glove that provides a covering for the thumb
3. A convex molding having a cross section in the form of a quarter of a circle or of an ellipse
What Scrabble words can I make with the letters in thumbs?
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Words that can be created with an extra letter added to thumbs:
I:bismuth