Yes, winnow is a Scrabble word!
...and is worth 12 points in Scrabble, and 14 points in Words with Friends
winnow
Verb
1. Separate the chaff from by using air currents
2. Blow on
3. Select desirable parts from a group or list
4. Blow away or off with a current of air
Noun
1. The act of separating grain from chaff
What Scrabble words can I make with the letters in winnow?
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Words that can be created with an extra letter added to winnow:
S:winnows