Yes, nubs is a Scrabble word!
...and is worth 6 points in Scrabble, and 9 points in Words with Friends
nubs
Noun
1. A small lump or protuberance
2. A small piece
3. The choicest or most essential or most vital part of some idea or experience
What Scrabble words can I make with the letters in nubs?
4 Letter Words
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3 Letter Words
2 Letter Words